A342772 Row sums of triangle A177028.

3, 4, 5, 9, 7, 8, 13, 13, 11, 17, 13, 14, 24, 20, 17, 25, 19, 20, 32, 27, 23, 33, 29, 26, 37, 37, 29, 41, 31, 32, 45, 41, 40, 56, 37, 38, 53, 48, 41, 57, 43, 44, 70, 55, 47, 65, 53, 50, 74, 62, 53, 73, 65, 56, 77, 69, 59, 81, 61, 62, 85, 80, 73, 98, 67, 68, 93, 88, 71, 97

Offset

3,1

Links

Michel Marcus, Table of n, a(n) for n = 3..10000

Formula

a(n) >= n.

For m in A090466, a(m) > m.

For m in A090467, a(m) = m.

Example

6 is a triangular and hexagonal number, so a(6) = 3 + 6 = 9.

Prog

(PARI) a(n) = sum(k=3, n, if (ispolygonal(n, k), k));

Crossrefs

Cf. A090466, A090467, A177028.

Sequence in context: A302653 A300738 A324506 * A065336 A079097 A202475

Adjacent sequences: A342769 A342770 A342771 * A342773 A342774 A342775

Keyword

nonn

Author

Michel Marcus, Mar 21 2021

Status

approved