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A074373
Square of the sum of the prime factors of n (with repetition).
5
0, 4, 9, 16, 25, 25, 49, 36, 36, 49, 121, 49, 169, 81, 64, 64, 289, 64, 361, 81, 100, 169, 529, 81, 100, 225, 81, 121, 841, 100, 961, 100, 196, 361, 144, 100, 1369, 441, 256, 121, 1681, 144, 1849, 225, 121, 625, 2209, 121, 196, 144, 400, 289, 2809, 121, 256
OFFSET
1,2
LINKS
EXAMPLE
a(12)=49 because 12=2*2*3, 2+2+3=7 and 7^2 = 49.
MATHEMATICA
sspf[n_]:=Total[Flatten[Table[#[[1]], {#[[2]]}]&/@FactorInteger[ n]]]^2; Join[{0}, Array[sspf, 60, 2]] (* Harvey P. Dale, Sep 24 2012 *)
CROSSREFS
Equals A001414^2.
Sequence in context: A017668 A225004 A339857 * A067115 A061077 A292675
KEYWORD
easy,nonn
AUTHOR
W. Neville Holmes, Aug 28 2002
STATUS
approved