In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number...

6th primary pseudoperfect number. 2,219,006,624 = 745 2,222,222,222 = repdigit 2,276,423,485 = number of ways to partition {1,2,...,12} and then partition...

pandigital number in base 8. 2,178,309 = Fibonacci number 2,222,222 = repdigit 2,266,502 = number of signed trees with 13 nodes 2,274,205 = the number...

ending in 1, 3, 7 or 9 221,760 = 32nd highly composite number 222,222 = repdigit 224,737 = the 20,000th prime number 227,475 = Riordan number 234,256 =...

set. 511 = 7 × 73. It is: a Harshad number. a palindromic number and a repdigit in bases 2 (1111111112) and 8 (7778) 5-1-1, a roadway status and transit...

= 1-automorphic number 214,358,881 = 146412 = 1214 = 118 222,222,222 = repdigit 222,222,227 = safe prime 223,092,870 = the product of the first nine prime...

colossally abundant number, 13th superior highly composite number 22,222,222 = repdigit 22,235,661 = 33×77 22,667,121 = 47612 = 694 24,010,000 = 49002 = 704 24...

eleventh primorial 208,023,278,209 = 28th Motzkin number. 222,222,222,222 = repdigit 225,851,433,717 = 56th Fibonacci number. 247,489,226,192 = number of centered...

000,000 = 307 22,164,361,129 = 1574642 = 28093 = 536 22,222,222,222 = repdigit 22,801,763,489 = 1,000,000,000th prime number 23,818,760,154 = number of...

Kaprekar number a lucky number a palindromic number in base ten the ninth repdigit the sum of the cubes of three consecutive integers: 99 = 23 + 33 + 43....

is the natural number following 221 and preceding 223. It is a decimal repdigit and a strobogrammatic number (meaning that it looks the same turned upside...

111, or 1111 that contains only the digit 1 — a more specific type of repdigit. The term stands for "repeated unit" and was coined in 1966 by Albert H...

Repdigits are a generalization of repunits; they are integers represented by repeated instances of the same digit. For example, 333 is a repdigit. The...

26-sided polygon is called an icosihexagon. φ(26) = φ(σ(26)). Twenty-six is a repdigit in bases three (2223) and twelve (2212). In base ten, 26 is the smallest...

is divisible by the sum of its digits. 285 is divisible by 15. 285 is a repdigit number in base 7. In base 7, 285 is 555. 285 is a very symmetric number...

(forty-four) is the natural number following 43 and preceding 45. Forty-four is a repdigit and palindromic number in decimal. It is the tenth 10-happy number, and...

cultural, and political contexts. 777 is an odd, composite, palindromic repdigit. It is also a sphenic number, an extravagant number, a lucky number, a...

palindromic number in bases 5 (3235), 10 (8810), 21 (4421), and 43 (2243). a repdigit in bases 10, 21 and 43. a 2-automorphic number. the smallest positive integer...

remaining Seventeen or Bust numbers in the Sierpinski problem 55555 = repdigit 55860 = harmonic divisor number 55987 = repunit prime in base 6 56011 =...

0.027. A palindromic number in bases 10, 14 (51514), and 36 (RR36). A repdigit in bases 10 and 36. The largest number in English not containing the letter...

Mertens function returns 0. 333 = 32 × 37, Mertens function returns 0; repdigit; 2333 is the smallest power of two greater than a googol. 334 = 2 × 167...

following 554 and preceding 556. 555 is a sphenic number. In base 10, it is a repdigit, and because it is divisible by the sum of its digits, it is a Harshad...

+34+35+36=666} . In fact, 666 is the largest triangular number that is also a repdigit. Since 36 is a triangular number too, 666 is a doubly triangular number...

92. the smallest pseudoprime satisfying the congruence 3n ≡ 3 mod n. a repdigit in base 9 (1119). palindromic in bases 3 (101013), 9 (1119), and 12 (7712)...

totient function φ(x) over the first twenty-one integers is 140. 140 is a repdigit in bases 13, 19, 27, 34, 69, and 139. 140 is also: The former Twitter entry-character...

is it ever a solution to x - φ(x), making it a noncototient. 170 is a repdigit in base 4 (2222) and base 16 (AA), as well as in bases 33, 84, and 169...

bases 3 (22223), 6 (2126), 9 (889), 15 (5515), 19 (4419) and 39 (2239). a repdigit in bases 3, 9, 15, 19 and 39. the sum of the first 4 twin prime pairs ((3...

regular 255-gon is constructible. In base 10, it is a self number. 255 is a repdigit in base 2 (11111111), in base 4 (3333), and in base 16 (FF). { 9 2 } =...

the terms 49, 65, 86 (it is the sum of the first two of these). 114 is a repdigit in base 7 (222). 114 (disambiguation) Sloane, N. J. A. (ed.). "Sequence...

the number of partitions for a set of size 4), a pentatope number, and a repdigit in binary (1111) and quaternary (33). In hexadecimal, and higher bases...