A089286 - OEIS

A089286

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

3, 31, 159, 352, 169, 314159, 392701, 10166, 7995, 9787003, 28954814, 157079632681, 68250087, 4349287, 67757089, 1002742628275, 1230782, 1307585156, 14846149, 1296180, 1024025943, 452477425, 1492388104

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OFFSET

0,1

LINKS

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

FORMULA

a(n) = A008472(A011545(n)).

EXAMPLE

n=6: floor(Pi*10^6) = 3141592 = 2*2*2*392699: a(6) = 2 + 392699 = 392701.

MATHEMATICA

Table[Total[FactorInteger[Floor[Pi 10^n]][[;; , 1]]], {n, 0, 30}] (* Harvey P. Dale, Sep 02 2023 *)

CROSSREFS

Cf. A089287, A089285, A089282, A000796.

Sequence in context: A227049 A078604 A195603 * A089287 A125085 A349199

Adjacent sequences: A089283 A089284 A089285 * A089287 A089288 A089289

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 30 2003

STATUS

approved