A176424 Partial sums of A029876.

1, 3, 6, 23, 50

Offset

0,2

Comments

Partial sums of number of Giuga sequences of length n. The only known primes in this partial sum are 3 and 23.

Links

Table of n, a(n) for n=0..4.

Formula

a(n) = SUM[i=0..n] A029876(i) = SUM[i=0..n] {numbers i such that p divides i/p - 1 for every prime divisor p of i}.

Example

a(4) = 1 + 2 + 3 + 17 + 27 = 50.

Crossrefs

Cf. A007850, A029876.

Sequence in context: A117850 A090910 A256674 * A341549 A151443 A148643

Adjacent sequences: A176421 A176422 A176423 * A176425 A176426 A176427

Keyword

nonn

Author

Jonathan Vos Post, Apr 17 2010

Status

approved