login
A318476
Multiplicative with a(p^e) = 2^A000108(e).
2
1, 2, 2, 4, 2, 4, 2, 32, 4, 4, 2, 8, 2, 4, 4, 16384, 2, 8, 2, 8, 4, 4, 2, 64, 4, 4, 32, 8, 2, 8, 2, 4398046511104, 4, 4, 4, 16, 2, 4, 4, 64, 2, 8, 2, 8, 8, 4, 2, 32768, 4, 8, 4, 8, 2, 64, 4, 64, 4, 4, 2, 16, 2, 4, 8, 5444517870735015415413993718908291383296, 4, 8, 2, 8, 4, 8, 2, 128, 2, 4, 8, 8, 4, 8, 2, 32768, 16384, 4, 2, 16, 4, 4, 4, 64, 2, 16, 4, 8, 4, 4, 4
OFFSET
1,2
FORMULA
a(n) = 2^A318475(n).
PROG
(PARI)
A000108(n) = (binomial(2*n, n)/(n+1));
A318476(n) = factorback(apply(e -> 2^A000108(e), factor(n)[, 2]));
CROSSREFS
Cf. also A069739.
Sequence in context: A366196 A278525 A357531 * A226083 A364918 A182730
KEYWORD
nonn,mult
AUTHOR
Antti Karttunen, Aug 29 2018
STATUS
approved