A158859 a(n) is formed by 2n+1 concatenations of the digit 2r+1 where n=r (mod 5).

1, 333, 55555, 7777777, 999999999, 11111111111, 3333333333333, 555555555555555, 77777777777777777, 9999999999999999999, 111111111111111111111, 33333333333333333333333

Offset: 0

Author

Paul Curtz, Mar 28 2009

Keywords

• nonn
• base

Comments

One 1, three 3's, five 5's, seven 7's, nine 9's, eleven 1's, thirteen 3's,

Crossrefs

Cf. A158849.

Extensions

Definition modified by R. J. Mathar, Apr 06 2009