A055966 n + reversal of base 20 digits of n (written in base 10).

0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336, 357, 378, 399, 420, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336, 357, 378, 399, 420

Offset: 0

Author

Henry Bottomley, Jul 18 2000

Keywords

• base
• nonn

Comments

If n has an even number of base 20 digits then a(n) is a multiple of 21.

Crossrefs

Cf. A056964.

Formula

a(n) = n + A056963(n).