A043056 a(n)=(s(n)+3)/6, where s(n)=n-th base 6 palindrome that starts with 3.

1, 4, 19, 20, 21, 22, 23, 24, 109, 116, 123, 130, 137, 144, 649, 655, 661, 667, 673, 679, 686, 692, 698, 704, 710, 716, 723, 729, 735, 741, 747, 753, 760, 766, 772, 778, 784, 790, 797, 803, 809, 815, 821, 827, 834, 840, 846, 852

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..500

Mathematica

b6p3Q[n_]:=Module[{idn6=IntegerDigits[n, 6]}, idn6==Reverse[idn6]&&idn6[[1]] == 3]; (#+3)/6&/@Select[Range[10000], b6p3Q] (* Harvey P. Dale, Feb 13 2023 *)

Crossrefs

Sequence in context: A362249 A070612 A165820 * A012879 A072178 A116980

Adjacent sequences: A043053 A043054 A043055 * A043057 A043058 A043059

Keyword

nonn,base

Author

Clark Kimberling

Status

approved