OFFSET
1,8
LINKS
FORMULA
PROG
(PARI)
A064989(n) = {my(f); f = factor(n); if((n>1 && f[1, 1]==2), f[1, 2] = 0); for (i=1, #f~, f[i, 1] = precprime(f[i, 1]-1)); factorback(f)};
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Apr 29 2020
STATUS
approved