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A260300
Bisection of A258409: a(n) = A258409(2n+1).
0
2, 4, 6, 2, 10, 12, 2, 16, 18, 2, 22, 4, 2, 28, 30, 2, 2, 36, 2, 40, 42, 2, 46, 6, 2, 52, 2, 2, 58, 60, 2, 4, 66, 2, 70, 72, 2, 2, 78, 2, 82, 4, 2, 88, 6, 2, 2, 96, 2, 100, 102, 2, 106, 108, 2, 112, 2, 2, 2, 10, 2, 4, 126, 2, 130, 6, 2, 136, 138, 2, 2, 4, 2, 148, 150
OFFSET
1,1
PROG
(PARI) a(n) = gcd(apply(x->x-1, divisors(2*n+1)));
CROSSREFS
Cf. A258409.
Sequence in context: A242593 A094752 A214061 * A182291 A071294 A060684
KEYWORD
nonn
AUTHOR
Michel Marcus, Nov 10 2015
STATUS
approved