A112457 a(1)=1; a(n+1)=desc(a(n))+a(n), where desc(x) is the description of x as in A005150.

1, 12, 1124, 212338, 1211334656, 1112213525496172, 31221113152327355441607884, 1311223113111543352330284851467051780698, 111321221321133115142315123621344927293054493947386362638861942616

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Example

Example a(2)=11+1=12, a(3)=1112+12=1124.

Prog

(Perl) #!/usr/bin/perl -l use strict; use warnings; use bigint; $_=1; { print my $o=$_; s/((\d)\2*)/(length $1).$2/ge; $_+=$o; <>, redo; } __END__

Crossrefs

Cf. A109229.

Sequence in context: A004073 A109229 * A091782 A291952 A112580 A229691

Adjacent sequences: A112454 A112455 A112456 * A112458 A112459 A112460

Keyword

base,easy,nonn

Author

Michele Dondi (blazar(AT)lcm.mi.infn.it), Sep 06 2005

Status

approved