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

Author

Henry Bottomley, Jul 18 2000

Keywords

• base
• nonn

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

Crossrefs

Cf. A030106, A056964.

Programs

Mathematica

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

PARI

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

Formula

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