OFFSET
1,2
COMMENTS
All terms are distinct and belong to A064522.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
FORMULA
EXAMPLE
a(2) = 2 * a(1) = 2.
a(5) = 5 * a(4) = 5 * a(2)^2 = 5 * 2^2 = 20.
PROG
(PARI) a(n) = my (f=factor(n), p=f[, 1]~, e=f[, 2]~); prod (i=1, #p, (p[i] * a(p[i] - 1))^e[i])
CROSSREFS
KEYWORD
nonn,mult
AUTHOR
Rémy Sigrist, Jul 17 2019
STATUS
approved