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A176424 Partial sums of A029876. 0
1, 3, 6, 23, 50 (list; graph; refs; listen; history; text; internal format)
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 * A151443 A148643 A240646

Adjacent sequences:  A176421 A176422 A176423 * A176425 A176426 A176427

KEYWORD

nonn

AUTHOR

Jonathan Vos Post, Apr 17 2010

STATUS

approved

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Last modified October 16 02:52 EDT 2019. Contains 328038 sequences. (Running on oeis4.)