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A342772
Row sums of triangle A177028.
4
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
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
KEYWORD
nonn
AUTHOR
Michel Marcus, Mar 21 2021
STATUS
approved