A043078 a(n)=(s(n)+2)/9, where s(n)=n-th base 9 palindrome that starts with 7.

1, 8, 64, 65, 66, 67, 68, 69, 70, 71, 72, 568, 578, 588, 598, 608, 618, 628, 638, 648, 5104, 5113, 5122, 5131, 5140, 5149, 5158, 5167, 5176, 5186, 5195, 5204, 5213, 5222, 5231, 5240, 5249, 5258, 5268, 5277, 5286, 5295, 5304, 5313

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1600

Mathematica

(#+2)/9&/@Select[Range[100000], IntegerDigits[#, 9][[1]]==7&&PalindromeQ[IntegerDigits[#, 9]]&] (* Harvey P. Dale, Jun 21 2025 *)

Crossrefs

Sequence in context: A014392 A393016 A008462 * A037413 A395593 A107626

Adjacent sequences: A043075 A043076 A043077 * A043079 A043080 A043081

Keyword

nonn,base

Author

Clark Kimberling

Status

approved