A063773 Smallest number that is centered polygonal in exactly n ways.

4, 10, 19, 31, 61, 211, 181, 361, 631, 841, 1261, 5461, 2521, 6931, 18481, 20791, 13861, 27721, 41581, 83161, 138601, 245701, 235621, 180181, 556921, 360361, 540541, 1670761, 1081081, 1413721, 2162161, 3603601, 4324321, 3063061

Offset

1,1

Links

Donovan Johnson, Table of n, a(n) for n = 1..90

Example

19 is the smallest number that is centered k-gonal for exactly three k (k = 3, 6, or 18). Hence a(3) = 19

Crossrefs

Sequence in context: A301022 A301119 A098576 * A155432 A155302 A155362

Adjacent sequences: A063770 A063771 A063772 * A063774 A063775 A063776

Keyword

nonn

Author

David W. Wilson, Aug 15 2001

Status

approved