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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 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 Cf. A078319, A078318, A078314. Sequence in context: A167554 A202392 A290410 * A306992 A325437 A141430 Adjacent sequences: A078317 A078318 A078319 * A078321 A078322 A078323 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.)