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 A043055 a(n)=(s(n)+4)/6, where s(n)=n-th base 6 palindrome that starts with 2. 1
 1, 3, 13, 14, 15, 16, 17, 18, 73, 80, 87, 94, 101, 108, 433, 439, 445, 451, 457, 463, 470, 476, 482, 488, 494, 500, 507, 513, 519, 525, 531, 537, 544, 550, 556, 562, 568, 574, 581, 587, 593, 599, 605, 611, 618, 624, 630, 636, 642 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..2000 MATHEMATICA b6pQ[n_]:=Module[{idn6=IntegerDigits[n, 6]}, idn6==Reverse[idn6]&&idn6[[1]] == 2]; (#+4)/6&/@Select[Range[10000], b6pQ] (* Harvey P. Dale, Jun 16 2019 *) CROSSREFS Sequence in context: A198452 A286190 A224693 * A101235 A230508 A045233 Adjacent sequences:  A043052 A043053 A043054 * A043056 A043057 A043058 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)