A316497 - OEIS

A316497

a(n) = gcd(A081939(n), A081939(n+1)).

2, 2, 2, 2, 11, 11, 11, 11, 11, 11, 11, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 13, 5, 7, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 22, 22, 22, 22, 22, 22, 22, 22, 22, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 22, 22, 22, 22, 22, 22, 22, 22, 22, 11, 55

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OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

Index entries for sequences related to palindromes

EXAMPLE

A081939(3)=6 and A081939(4)=8, so a(3)=gcd(6,8)=2.

MAPLE

# with list R containing terms of A081939

seq(igcd(R[i], R[i+1]), i=1..nops(R)-1)

CROSSREFS