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A043055
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a(n)=(s(n)+4)/6, where s(n)=n-th base 6 palindrome that starts with 2.
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1
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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
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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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 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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