A048283 - OEIS

A048283

For k >= a(n), there are A048284(n) numbers expressible as a sum of exactly k-n k-gonal numbers.

6, 9, 10, 13, 16, 19, 20, 22, 25, 28, 29, 31, 34, 37, 40, 41, 43, 46, 49, 52, 53, 54, 57, 58, 61, 64, 67, 68, 70, 73, 74, 75, 78, 81, 84, 86, 89, 90, 92, 93, 94, 96, 99, 102, 105, 108, 109, 110, 112, 113, 115, 118, 121, 124, 126, 129, 130, 132, 133, 136, 137, 138, 140, 143, 146, 149, 152

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OFFSET

0,1

LINKS

Table of n, a(n) for n=0..66.

EXAMPLE

For k >= 6, the 2 numbers 2k-1 and 5k-4 are the sum of at best k k-gonal numbers. Hence a(0) = 6.

For k >= 9, the 4 numbers k-1, 2k-2, 4k-4 and 5k-5 are the sum of at best k-1 k-gonal numbers. Hence a(1) = 9.

For k >= 10, the 6 numbers k-2, 2k-3, 3k-4, 4k-5, 5k-6 and 8k-9 are the sum of at best k-2 k-gonal numbers. Hence a(2) = 10.

CROSSREFS

Sequence in context: A125494 A177029 A105066 * A169692 A359371 A337287

Adjacent sequences: A048280 A048281 A048282 * A048284 A048285 A048286