OFFSET
1,1
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
PROG
(PARI) rad(n)=my(f=factor(n)[, 1]); prod(i=1, #f, f[i])
a(n)=my(f=factor(n*rad(n)+1)); sum(i=1, #f~, f[i, 1]*f[i, 2]) \\ Charles R Greathouse IV, Jul 15 2013
(Haskell)
a078320 = a001414 . a078310 -- Reinhard Zumkeller, Jul 23 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 23 2002
STATUS
approved