A176661 Partial sums of A061262.

0, 3, 15, 36, 88, 145, 236, 357, 493, 704, 896, 1122, 1531, 1862, 2229, 2635, 3146, 3653, 4539, 5176, 5948, 6669, 7540, 8492, 9594, 10660, 11887, 13079, 14720, 16341, 17737, 19118, 20619, 22351, 24143, 26070, 28012, 30413, 33024, 35575, 37997

Offset: 0

Author

Jonathan Vos Post, Apr 23 2010

Keywords

• nonn

Comments

Partial sums of smallest number representable as the sum of 3 triangular numbers in exactly n ways. The subsequence of triangular numbers in the partial sum begins: 3, 15, 36. The subsequence of primes in the partial sum begins: 3, 1531, 11887, 17737, 37997, 43441.

Examples

			a(13) = 0 + 3 + 12 + 21 + 52 + 57 + 91 + 121 + 136 + 211 + 192 + 226 + 409 = 1531 is prime.
		

Crossrefs

Cf. A061262, A000217, A053614, A060773, A002636, A124978.

Formula

a(n) = SUM[i=0..n] A061262(i).