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, 381315143079137, 989849547461, 841346597336054828

Offset: 0

Author

Reinhard Zumkeller, Oct 30 2003

Keywords

• nonn

Examples

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

Links

• Tyler Busby, Table of n, a(n) for n = 0..200

Crossrefs

Cf. A089287, A089285, A089282, A000796.

Programs

Mathematica

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

Formula

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

Extensions

a(23)-a(25) from Tyler Busby, Mar 14 2025