A113721 - OEIS

A113721

Concatenation of the numbers of equal successive digits of previous two terms read in inverse order, starting with a(1)=a(2)=1.

1, 1, 2, 11, 21, 112, 131, 11112, 1511, 21114, 131211, 21111131, 115121111, 41113151, 11113141112, 13111511131, 1131311131114, 13131113131311, 2111113111113131112, 13111515121111131111, 41511111311131115151

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OFFSET

1,3

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

As a(5)=112 and a(6)=131, their digits in inverse order are 131211 and that is (1) 1 followed by (1) 3, (1) 1, (1) 2 and (2) 1's, so a(7) = 11112.

CROSSREFS

Cf. A113720.

Sequence in context: A245500 A342945 A266202 * A127199 A085652 A111090

Adjacent sequences: A113718 A113719 A113720 * A113722 A113723 A113724

KEYWORD

nonn,base

AUTHOR

Floor van Lamoen, Nov 08 2005

EXTENSIONS

Definition adapted to offset by Georg Fischer, Jun 18 2021

STATUS

approved