A180624 Partials sums of A090615.

1264460, 3379784, 6164364, 11102500, 18271604, 36320580, 54976960, 83135125, 129857825, 210986457, 385264277, 594788487, 924792067, 1423007483, 2659409715, 4458691045, 6846467595, 9563962830, 12443660134, 16149431959

Offset

1,1

Comments

Partials sums of smallest member of sociable quadruples. Primes in this partial sum begin: 924792067, 16149431959.

Links

Table of n, a(n) for n=1..20.

Eric W. Weisstein, Sociable Numbers

Formula

a(n) = sum[i=1..n] A090615(i).

Example

a(13) = 1264460 + 2115324 + 2784580 + 4938136 + 7169104 + 18048976 + 18656380 + 28158165 + 46722700 + 81128632 + 174277820 + 209524210 + 330003580 = 924792067 is prime.

Crossrefs

Cf. A090615.

Sequence in context: A072892 A090615 A222975 * A081430 A254026 A254019

Adjacent sequences: A180621 A180622 A180623 * A180625 A180626 A180627

Keyword

nonn,less

Author

Jonathan Vos Post, Sep 13 2010

Status

approved