A043070 a(n)=(s(n)+2)/8, where s(n)=n-th base 8 palindrome that starts with 6 (in base 8), written in decimal digits.

1, 7, 49, 50, 51, 52, 53, 54, 55, 56, 385, 394, 403, 412, 421, 430, 439, 448, 3073, 3081, 3089, 3097, 3105, 3113, 3121, 3129, 3138, 3146, 3154, 3162, 3170, 3178, 3186, 3194, 3203, 3211, 3219, 3227, 3235, 3243, 3251, 3259

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Programs

Mathematica

(#+2)/8&/@Select[Range[30000],IntegerDigits[#,8][[1]]==6&&IntegerDigits[#,8] == Reverse[ IntegerDigits[#,8]]&] (* Harvey P. Dale, May 07 2022 *)

Extensions

Definition clarified by Harvey P. Dale, May 07 2022