OFFSET
1,2
COMMENTS
The sequence is well defined as computing a(p^k) involves terms of the form a(q) with q < p.
The fixed points are the divisors of 1806 = 2 * 3 * 7 * 43; they correspond to the first 16 terms of A191614.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
EXAMPLE
a(2) = a(1) + 1 = 1 + 1 = 2.
a(3) = a(2) + 1 = 2 + 1 = 3.
a(7) = a(6) + 1 = a(2)*a(3) + 1 = 2 * 3 + 1 = 7.
a(43) = a(42) + 1 = a(2)*a(3)*a(7) + 1 = 2*3*7 + 1 = 43.
PROG
(PARI) a(n) = my (f=factor(n)); prod (i=1, #f~, a(f[i, 1]-1)^f[i, 2]+1)
CROSSREFS
KEYWORD
nonn,mult
AUTHOR
Rémy Sigrist, Oct 17 2019
STATUS
approved