The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A234646

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A234646

Sum of the distinct prime divisors of n^3 + 1.
(history; published version)

#5 by Ralf Stephan at Sun Jan 05 05:59:20 EST 2014

STATUS

proposed

approved

#4 by Vincenzo Librandi at Wed Jan 01 04:13:51 EST 2014

STATUS

editing

proposed

#3 by Vincenzo Librandi at Wed Jan 01 04:00:58 EST 2014

LINKS

Vincenzo Librandi, <a href="/A234646/b234646.txt">Table of n, a(n) for n = 0..1000</a>

EXAMPLE

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

#2 by Vincenzo Librandi at Wed Jan 01 02:19:18 EST 2014

NAME

allocated for Vincenzo LibrandiSum of the distinct prime divisors of n^3 + 1.

DATA

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

0,2

MATHEMATICA

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

CROSSREFS

Cf. A193462.

KEYWORD

allocated

nonn

AUTHOR

Vincenzo Librandi, Jan 01 2014

STATUS

approved

editing

#1 by Vincenzo Librandi at Sun Dec 29 02:24:36 EST 2013

NAME

allocated for Vincenzo Librandi

KEYWORD

allocated

STATUS

approved