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See A118282 for the conjectured largest number that is not the sum of three generalized n-gonal numbers. For n=7, only four numbers are not representable: 10, 16, 76 and 307.
Table of n, a(n) for n=3..23.
Sequence in context: A196528 A135897 A039816 * A095891 A095887 A225213
Adjacent sequences: A118280 A118281 A118282 * A118284 A118285 A118286
T. D. Noe, Apr 21 2006