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40 relations: Abundant number, Area codes 210 and 726, Composite number, Goldbach's conjecture, Harshad number, Idoneal number, Natural number, Pentagonal number, Pentatope number, Polygonal number, Prime number, Primorial, Primorial prime, Pronic number, Triangular number, Untouchable number, 1, 10, 105 (number), 14 (number), 15 (number), 176 (number), 190 (number), 2, 209 (number), 21 (number), 210, 210 BC, 211 (number), 231 (number), 247 (number), 3, 30 (number), 35 (number), 400 (number), 42 (number), 5, 6, 7, 70 (number).
Abundant number
In number theory, an abundant number or excessive number is a number for which the sum of its proper divisors is greater than the number itself.
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Area codes 210 and 726
Area codes 210 and 726 are North American telephone area codes for numbers in and near San Antonio, Texas.
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Composite number
A composite number is a positive integer that can be formed by multiplying together two smaller positive integers.
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Goldbach's conjecture
Goldbach's conjecture is one of the oldest and best-known unsolved problems in number theory and all of mathematics.
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Harshad number
In recreational mathematics, a harshad number (or Niven number) in a given number base, is an integer that is divisible by the sum of its digits when written in that base.
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Idoneal number
In mathematics, Euler's idoneal numbers (also called suitable numbers or convenient numbers) are the positive integers D such that any integer expressible in only one way as x2 ± Dy2 (where x2 is relatively prime to Dy2) is a prime, prime power, twice one of these, or a power of 2.
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Natural number
In mathematics, the natural numbers are those used for counting (as in "there are six coins on the table") and ordering (as in "this is the third largest city in the country").
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Pentagonal number
A pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon, but, unlike the first two, the patterns involved in the construction of pentagonal numbers are not rotationally symmetrical.
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Pentatope number
A pentatope number is a number in the fifth cell of any row of Pascal's triangle starting with the 5-term row 1 4 6 4 1 either from left to right or from right to left.
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Polygonal number
In mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon.
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Prime number
A prime number (or a prime) is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.
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Primorial
In mathematics, and more particularly in number theory, primorial is a function from natural numbers to natural numbers similar to the factorial function, but rather than successively multiplying positive integers, only prime numbers are multiplied.
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Primorial prime
In mathematics, primorial primes are prime numbers of the form pn# ± 1, where pn# is the primorial of pn (the product of the first n primes).
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Pronic number
A pronic number is a number which is the product of two consecutive integers, that is, a number of the form.
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Triangular number
A triangular number or triangle number counts objects arranged in an equilateral triangle, as in the diagram on the right.
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Untouchable number
An untouchable number is a positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer (including the untouchable number itself).
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1
1 (one, also called unit, unity, and (multiplicative) identity) is a number, numeral, and glyph.
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10
10 (ten) is an even natural number following 9 and preceding 11.
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105 (number)
105 (one hundred five) is the natural number following 104 and preceding 106.
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14 (number)
14 (fourteen) is a natural number following 13 and succeeded by 15.
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15 (number)
15 (fifteen) is a number, numeral, and glyph.
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176 (number)
176 (one hundred seventy-six) is the natural number following 175 and preceding 177.
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190 (number)
190 (one hundred ninety) is the natural number following 189 and preceding 191.
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2
2 (two) is a number, numeral, and glyph.
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209 (number)
209 (two hundred nine) is the natural number following 208 and preceding 210.
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21 (number)
21 (twenty-one) is the natural number following 20 and preceding 22.
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210
Year 210 (CCX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.
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210 BC
Year 210 BC was a year of the pre-Julian Roman calendar.
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211 (number)
211 (two hundred eleven) is the natural number between 210 and 212.
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231 (number)
231 (two hundred thirty-one) is the natural number following 230 and preceding 232.
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247 (number)
247 (two hundred forty-seven) is the natural number following 246 and preceding 248.
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3
3 (three) is a number, numeral, and glyph.
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30 (number)
30 (thirty) is the natural number following 29 and preceding 31.
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35 (number)
35 (thirty-five) is the natural number following 34 and preceding 36.
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400 (number)
400 (four hundred) is the natural number following 399 and preceding 401.
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42 (number)
42 (forty-two) is the natural number that succeeds 41 and precedes 43.
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5
5 (five) is a number, numeral, and glyph.
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6
6 (six) is the natural number following 5 and preceding 7.
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7
7 (seven) is the natural number following 6 and preceding 8.
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70 (number)
70 (seventy) is the natural number following 69 and preceding 71.
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References
[1] https://en.wikipedia.org/wiki/210_(number)
