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A113720
Concatenation of the numbers of equal successive digits of previous two terms, starting with a(1)=a(2)=1.
1
1, 1, 2, 11, 12, 31, 1111, 15, 51, 121, 1211, 11212, 114111, 2111213, 21313111, 13111111113, 111114181, 118151111, 5111131114, 2111414131, 1413113111111, 131111111111216, 1111217110111, 13101114111213, 4111214111313111
OFFSET
1,3
EXAMPLE
As a(6)=1111 and a(7)=15, their digits are 111115, that is (5) 1's followed by (1) 1, so a(8) = 51.
CROSSREFS
Cf. A113721.
Sequence in context: A136996 A238109 A374596 * A034118 A140148 A117547
KEYWORD
nonn,base
AUTHOR
Floor van Lamoen, Nov 08 2005
EXTENSIONS
Definition adapted to offset by Georg Fischer, Jun 18 2021
STATUS
approved