A234646 Sum of the distinct prime divisors of n^3 + 1.

0, 2, 3, 9, 18, 12, 38, 45, 22, 80, 31, 42, 39, 166, 69, 213, 258, 25, 326, 14, 137, 434, 486, 18, 91, 616, 41, 65, 786, 281, 111, 28, 345, 177, 1135, 402, 147, 95, 90, 1490, 271, 559, 1766, 165, 639, 315, 175, 115, 105, 201, 82, 2566, 439, 924, 432, 2980, 114

Offset: 0

Author

Vincenzo Librandi, Jan 01 2014

Keywords

• nonn

Examples

			a(3) = 9 because 3^3+1 = 28 and the sum of the 2 distinct prime divisors {2, 7} is 9.
		

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A193462.

Programs

Mathematica

Join[{0}, Table[Total[Transpose[FactorInteger[n^3 + 1]][[1]]], {n, 60}]]