OFFSET
1,1
EXAMPLE
NPPSigma(2^5*7^4)=(1+2+2^4)*(1+7+7^4)=45771
13770=2*3^4*5*17 so NPPSigma(2*3^4*5*17)=(1+2^1)*(1+3^1+3^4)*(1+5^1)*(1+17^1)=2*13770.
Factorizations : 2*3, 2^4*3*5*19, 13770=2*3^4*5*17, 2^6*3*7*83, ...
CROSSREFS
KEYWORD
nonn
AUTHOR
Yasutoshi Kohmoto, Nov 06, 2004
EXTENSIONS
Corrected and extended by Farideh Firoozbakht, Nov 07 2004
STATUS
approved