A004073 Start with a(1)=1; to get a(n) replace each i in a(n-1) with 12...i, then append n.

1, 12, 1123, 11121234, 1111211212312345, 11111211121121231121231234123456, 1111112111121112112123111211212311212312341121231234123451234567

Offset

1,2

Comments

Digits sum to A000225.

Links

Table of n, a(n) for n=1..7.

T. Kubo and R. Vakil, On Conway's recursive sequence, Discr. Math. 152 (1996), 225-252.

Crossrefs

Sequence in context: A160010 A325906 A181718 * A109229 A112457 A091782

Adjacent sequences: A004070 A004071 A004072 * A004074 A004075 A004076

Keyword

nonn,base

Author

N. J. A. Sloane

Extensions

The next term is too large to include.

Status

approved