A115696 Pentagonal numbers (A000326) whose digit reversal is a powerful(1) number (A001694).

1, 925, 1426, 6112, 9801, 140301, 251945, 578151, 2112860, 78883630, 466005001, 52244922262, 394240923000, 527042773467, 706743866647, 797657661680, 869119510700, 1445531162626, 3905876132501, 5205252778462, 63253297234426, 135399021815552

Offset

1,2

Links

Table of n, a(n) for n=1..22.

Example

925 is the 25th pentagonal number and 529=23^2 is powerful.

Crossrefs

Cf. A000326, A001694, A115695.

Sequence in context: A172912 A172702 A159701 * A066741 A325141 A244169

Adjacent sequences: A115693 A115694 A115695 * A115697 A115698 A115699

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Extensions

a(19)-a(22) from Donovan Johnson, Jun 29 2011

Status

approved