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A078320 Sum of all prime factors of n*rad(n)+1, where rad=A007947 (squarefree kernel). 4
2, 5, 7, 6, 15, 37, 12, 17, 11, 101, 63, 73, 24, 197, 115, 14, 36, 109, 183, 70, 32, 102, 60, 34, 15, 677, 43, 134, 423, 70, 52, 18, 116, 102, 615, 38, 144, 39, 763, 401, 60, 358, 49, 39, 30, 102, 37, 34, 49, 170, 1303, 55, 288, 23, 108, 162, 30, 678, 1743, 1801 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(n)=A001414(A078310(n)).
LINKS
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
Sequence in context: A167554 A202392 A290410 * A306992 A325437 A141430
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 23 2002
STATUS
approved

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Last modified June 19 15:41 EDT 2024. Contains 373503 sequences. (Running on oeis4.)