A089287 - OEIS

A089287

Sum of all prime factors of floor(Pi*10^n), Pi=3.14....

3, 31, 159, 355, 169, 314159, 392705, 10166, 7998, 9787003, 28954814, 157079632681, 68250087, 4349287, 67757089, 1002742628275, 1230791, 1307585156, 14846149, 1296188, 1024025943, 452477425, 1492388104

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OFFSET

0,1

COMMENTS

a(n) = A001414(A011545(n)).

LINKS

Table of n, a(n) for n=0..22.

EXAMPLE

n=6: floor(Pi*10^6)=3141592=2*2*2*392699: a(6)=2+2+2+392699=392705.

MATHEMATICA

sapf[n_]:=Total[Flatten[Table[#[[1]], #[[2]]]&/@FactorInteger[n]]]; sapf/@ Floor[Pi 10^Range[0, 30]] (* Harvey P. Dale, Nov 18 2018 *)

CROSSREFS

Cf. A089286, A089285, A089283, A000796.

Sequence in context: A078604 A195603 A089286 * A125085 A349199 A007233

Adjacent sequences: A089284 A089285 A089286 * A089288 A089289 A089290

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 30 2003

STATUS

approved