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 A234861 Sum of the distinct prime divisors of n^3 - 1. 1
 0, 7, 15, 10, 33, 48, 24, 80, 22, 40, 33, 168, 66, 224, 250, 28, 309, 24, 132, 440, 470, 23, 99, 624, 43, 61, 772, 274, 89, 55, 341, 189, 1125, 411, 129, 86, 79, 1520, 251, 563, 1730, 193, 643, 333, 141, 118, 123, 241, 67, 2558, 393, 939, 431, 3024, 97, 150 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE a(3) = 15 because 3^3-1 = 26 and the sum of the 2 distinct prime divisors {2, 13} is 15. MATHEMATICA Table[Total[Transpose[FactorInteger[n^3 - 1]][[1]]], {n, 50}] CROSSREFS Cf. A062835. Sequence in context: A289966 A290621 A290629 * A076401 A180114 A204740 Adjacent sequences:  A234858 A234859 A234860 * A234862 A234863 A234864 KEYWORD nonn AUTHOR Vincenzo Librandi, Jan 01 2014 STATUS approved

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Last modified December 13 03:41 EST 2019. Contains 329968 sequences. (Running on oeis4.)