OFFSET
1,2
COMMENTS
This sequence contains every power of 2; see A303819 for the corresponding least indices.
For any n > 0, a(n) only depends on the prime signature of n.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
FORMULA
PROG
(PARI) a(n) = my (f=factor(n)); prod (i=1, #f~, 2^a(f[i, 2]))
CROSSREFS
KEYWORD
nonn,easy,mult
AUTHOR
Rémy Sigrist, Apr 30 2018
STATUS
approved