A115680 Pentagonal numbers (A000326) whose digit reversal is a brilliant number (A078972).

12, 51, 176, 715, 925, 1426, 3151, 3290, 10795, 15251, 16172, 19097, 79235, 92132, 114955, 117460, 119992, 127750, 150575, 355510, 755795, 779401, 1010651, 1108970, 1258126, 1274665, 1294097, 1463722, 1466687, 1675345, 1881040

Offset

1,1

Links

Table of n, a(n) for n=1..31.

Example

3151 is the 46th pentagonal number and 1513=17*89 is brilliant.

Crossrefs

Cf. A000326, A078972, A115679.

Sequence in context: A200887 A236770 A334695 * A231298 A231359 A066757

Adjacent sequences: A115677 A115678 A115679 * A115681 A115682 A115683

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Status

approved