A115703 Pentagonal numbers (A000326) whose digit reversal is the product of 2 palindromes greater than 1.

12, 22, 51, 210, 330, 425, 1162, 2882, 3876, 4510, 6902, 8400, 9801, 14652, 15251, 22632, 27270, 29330, 32340, 52360, 54055, 55777, 58707, 66676, 68587, 104412, 197472, 217551, 279720, 298151, 319935, 341055, 448540, 468442, 481950

Offset

1,1

Links

Table of n, a(n) for n=1..35.

Example

14652 is the 99th pentagonal number and 25641=77*333.

Crossrefs

Cf. A000326, A115683.

Sequence in context: A153361 A200197 A115709 * A014633 A298323 A299216

Adjacent sequences: A115700 A115701 A115702 * A115704 A115705 A115706

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Status

approved