OFFSET
1,1
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10000
EXAMPLE
PROG
(PARI)
A003415checked(n) = if(n<=1, 0, my(f=factor(n), s=0); for(i=1, #f~, if(f[i, 2]>=f[i, 1], return(0), s += f[i, 2]/f[i, 1])); (n*s));
isA328117(n) = { while((n>7), n = A003415checked(n)); (7==n); };
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Oct 06 2019
STATUS
approved