OFFSET
1,6
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537
FORMULA
PROG
(PARI) A327156(n) = { my(m=1, v); fordiv(n, d, if((d>1) && ((v = valuation(n, sigma(d)))>0), m *= prime(v))); (m); };
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 18 2019
STATUS
approved