In mathematics, a dodecagonal number is a figurate number that represents a dodecagon. The dodecagonal number for n is given by the formula D n = 5 n...

111, 166, 232, 309, 397, 496, 606, 727, ... (OEIS: A069125), centered dodecagonal numbers 1, 13, 37, 73, 121, 181, 253, 337, 433, 541, 661, 793, ... (OEIS: A003154)...

other hand, the 33rd triangular number 561 is the first Carmichael number. 33 is also the first non-trivial dodecagonal number (like 369, and 561) and the...

by concentric cubical layers of points), the nineteenth dodecagonal number (a figurate number in which the arrangement of points resembles the shape of...

of Graham's number in the rapidly growing sequence 3↑↑↑↑3, 3 ↑3↑↑↑↑3 3, … the number of vertices in a 6-cube, the fourth dodecagonal number, and the seventh...

the natural number following 104 and preceding 106. 105 is the 14th triangular number, a dodecagonal number, and the first Zeisel number. It is the first...

star number is made up of a central point and 12 copies of the (n−1)th triangular number — making it numerically equal to the nth centered dodecagonal number...

divisible by the sum of its digits, 19. 1729 is also the nineteenth dodecagonal number. 19, alongside 109, 1009, and 10009, are all prime (with 109 also...

built in 2008. 460 = 22 × 5 × 23, centered triangular number, dodecagonal number, Harshad number, sum of twelve consecutive primes (17 + 19 + 23 + 29 +...

cubes of the first ten integers, centered octagonal number, dodecagonal number 3037 – star number, cousin prime with 3041 3045 – sum of the integers 196...

natural number, following 155 and preceding 157. 156 is an abundant number, a pronic number, a dodecagonal number, and a refactorable number. 156 is the...

tambala, 1986–1995 Mexican 20 centavos, 1992-2009 Israeli 5 new shekel Dodecagonal number Dodecahedron – any polyhedron with 12 faces. Dodecagram "Wolfram Demonstrations...

Markov number 142,129 = 3772, square number, dodecagonal number 142,857 = Kaprekar number, smallest cyclic number in decimal. 144,000 = number with religious...

polygonal number, 181 is: a centered square number, a centered pentagonal number, a centered dodecagonal number, a centered 18-gonal number, and a centered...

pyramidal number and a dodecagonal number. Additionally, it is the index, in the sequence of triangular numbers, of the fifth square triangular number: 41616...

A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that...

month, the number of pairs of rabbits is equal to the number of mature pairs (that is, the number of pairs in month n – 2) plus the number of pairs alive...

A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Accordingly it is a positive integer that has...

the number 1 differently than larger numbers, sometimes even not as a number at all. Euclid, for example, defined a unit first and then a number as a...

are also consecutive star numbers, equivalently consecutive centered dodecagonal (12-gonal) numbers (respectively the 4th and the 3rd). They are successive...

mathematics, a Mersenne prime is a prime number that is one less than a power of two. That is, it is a prime number of the form Mn = 2n − 1 for some integer...

order four, and the only Archimedean solid to tessellate space. The dodecagonal prism, which is the largest prism that can tessellate space alongside...

In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number...

commonly used to refer to centered dodecagonal numbers. The n {\displaystyle n} th octagonal number is the number of partitions of 6 n − 5 {\displaystyle...

In number theory, a happy number is a number which eventually reaches 1 when the number is replaced by the sum of the square of each digit. For instance...

In mathematics, a polygonal number is a number that counts dots arranged in the shape of a regular polygon: 2-3 . These are one type of 2-dimensional figurate...

A palindromic number (also known as a numeral palindrome or a numeric palindrome) is a number (such as 16361) that remains the same when its digits are...

In 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...

In mathematics, a double Mersenne number is a Mersenne number of the form M M p = 2 2 p − 1 − 1 {\displaystyle M_{M_{p}}=2^{2^{p}-1}-1} where p is prime...

In mathematics, a Fermat number, named after Pierre de Fermat (1601–1665), the first known to have studied them, is a positive integer of the form: F n...