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A043051 a(n)=(s(n)+3)/5, where s(n)=n-th base 5 palindrome that starts with 2. 0
1, 3, 11, 12, 13, 14, 15, 51, 57, 63, 69, 75, 251, 256, 261, 266, 271, 277, 282, 287, 292, 297, 303, 308, 313, 318, 323, 329, 334, 339, 344, 349, 355, 360, 365, 370, 375, 1251, 1281, 1311, 1341, 1371, 1377, 1407, 1437, 1467, 1497 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..47.

MATHEMATICA

pal5Q[n_]:=Module[{idn5=IntegerDigits[n, 5]}, idn5==Reverse[idn5]&&First[idn5]==2]

(#+3)/5&/@Select[Range[9000], pal5Q]  (* Harvey P. Dale, Feb 13 2011 *)

CROSSREFS

Sequence in context: A232038 A072980 A128500 * A024545 A101134 A045110

Adjacent sequences:  A043048 A043049 A043050 * A043052 A043053 A043054

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 29 12:13 EDT 2017. Contains 288860 sequences.