A115745 Pentagonal numbers (A000326) that are the product of 2 palindromes greater than 1.

12, 22, 35, 176, 330, 2380, 2625, 2882, 3432, 3876, 4845, 8855, 9801, 12650, 14652, 15251, 21901, 26070, 52360, 61105, 66045, 84847, 111657, 137562, 156332, 197472, 230300, 254410, 260625, 270725, 287547, 295482, 351142, 359905

Offset

1,1

Links

Table of n, a(n) for n=1..34.

Example

66045 is the 210th pentagonal number and 66045=111*595.

Crossrefs

Cf. A000326, A115683, A115743, A115744.

Sequence in context: A098955 A285470 A124885 * A129639 A153361 A200197

Adjacent sequences: A115742 A115743 A115744 * A115746 A115747 A115748

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Status

approved