44444

Appears in sequences

• a(n) = 4*(10^n - 1)/9.at n=5A002278
• Repdigit numbers, or numbers whose digits are all equal.at n=40A010785
• Numbers > 9 with all digits the same.at n=30A014181
• Quotient of 'base-3' division described in A032537.at n=33A032538
• Fancy primitive repdigit polygonal numbers.at n=15A033704
• Fancy primitive repdigit polygonal numbers (with multiplicity).at n=16A033705
• Trajectory of 3 under map n->49n+1 if n odd, n->n/2 if n even.at n=6A037122
• Append d digits d after each digit d in decimal expansion of n.at n=4A048377
• Write what is described (putting a leading zero on numbers which have an odd number of digits).at n=54A056967
• Digits composite, each digit minus 1 is prime, sum of digits minus 1 is prime, difference of digits (in absolute value) minus 1 is prime.at n=46A058229
• Each permutation in the list A060117 converted to Site Swap notation, with digits reversed and inverted. "Zero throws" (fixed elements) indicated with 0's.at n=33A060498
• Geometric mean of digits = 4 and digits are in nondecreasing order.at n=14A069518
• Repdigits (A010785), excluding repunits (A002275), ordered by product of digits (A007954).at n=35A070841
• Nonsquarefree numbers obtained by repeating a single digit.at n=14A077572
• a(n) = 0^n + ((n-9)/9)*(1-10^n).at n=5A091686
• Integers are written in the form abcd...n where "a" means "At position a in this integer there is a digit b"; "b" means: "at position b there is a digit c"; "c" means: "at position c there is a digit d"; ... and "n" means: "at position n there is a digit a".at n=21A105956
• 4-almost primes with semiprime digits (digits 4, 6, 9 only).at n=21A111496
• a(n)*n = A112893(n).at n=4A112894
• a(n) is the smallest number representable in exactly n ways as a sum of 2 palindromes (each of them >= 0).at n=38A115336
• Twice repdigit numbers.at n=38A152966