A074373 Square of the sum of the prime factors of n (with repetition).

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

Author

W. Neville Holmes, Aug 28 2002

Keywords

• easy
• nonn

Examples

			a(12)=49 because 12=2*2*3, 2+2+3=7 and 7^2 = 49.
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000
• Neville Holmes, Integer Sequence Combinations

Crossrefs

Equals A001414^2.

Programs

Mathematica

sspf[n_]:=Total[Flatten[Table[#[[1]],{#[[2]]}]&/@FactorInteger[ n]]]^2; Join[{0},Array[sspf,60,2]] (* Harvey P. Dale, Sep 24 2012 *)