A166713 Alliterative-digit numbers: Positive integers n such that the English names of the decimal digits of n begin with the same letter; ignore single-digit numbers.

11, 22, 23, 32, 33, 44, 45, 54, 55, 66, 67, 76, 77, 88, 99, 111, 222, 223, 232, 233, 322, 323, 332, 333, 444, 445, 454, 455, 544, 545, 554, 555, 666, 667, 676, 677, 766, 767, 776, 777, 888, 999, 1111, 2222, 2223, 2232, 2233, 2322, 2323, 2332, 2333, 3222, 3223

Offset

1,1

Comments

The multi-digit repdigits (A014181) are a subsequence. No term contains the digit 0 (zero). All terms containing digits 1 (one), 8 (eight), or 9 (nine) are also terms of A014181. Any term not mentioned above is a string of 2's (twos) and 3's (threes) only (a multi-digit term of A032810), 4's (fours) and 5's (fives) only, or 6's (sixes) and 7's (sevens) only.

Links

Table of n, a(n) for n=1..53.

Example

454 is a term as digits "four", "five", "four" each begin with the letter "f".

Crossrefs

Cf. A146755, A014181, A032810.

Sequence in context: A140452 A048136 A180054 * A297273 A296746 A095779

Adjacent sequences: A166710 A166711 A166712 * A166714 A166715 A166716

Keyword

base,easy,nonn,word

Author

Rick L. Shepherd, Oct 19 2009

Status

approved