A055954 a(n) = n + reversal of base 7 digits of n (written in base 10).

0, 2, 4, 6, 8, 10, 12, 8, 16, 24, 32, 40, 48, 56, 16, 24, 32, 40, 48, 56, 64, 24, 32, 40, 48, 56, 64, 72, 32, 40, 48, 56, 64, 72, 80, 40, 48, 56, 64, 72, 80, 88, 48, 56, 64, 72, 80, 88, 96, 50, 100, 150, 200, 250, 300, 350, 64, 114, 164, 214, 264, 314, 364, 78, 128, 178

Offset

0,2

Comments

If n has an even number of digits in base 7 then a(n) is a multiple of 8

Links

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Formula

a(n) = n + A030106(n).

Mathematica

Table[n+FromDigits[Reverse[IntegerDigits[n, 7]], 7], {n, 0, 70}] (* Harvey P. Dale, Jan 29 2020 *)

Prog

(PARI) a(n) = n + fromdigits(Vecrev(digits(n, 7)), 7); \\ Michel Marcus, Aug 08 2024

Crossrefs

Cf. A030106, A056964.

Sequence in context: A356431 A345444 A319807 * A366021 A365453 A365984

Adjacent sequences: A055951 A055952 A055953 * A055955 A055956 A055957

Keyword

base,nonn

Author

Henry Bottomley, Jul 18 2000

Status

approved