A115679 Brilliant numbers (A078972) whose digit reversal is a pentagonal number (A000326).

10, 15, 21, 517, 529, 671, 1513, 6241, 15251, 23129, 27161, 53297, 59701, 79091, 104977, 299911, 559411, 575051, 597557, 1560101, 2178727, 2273641, 2390393, 2966429, 5354893, 5429329, 5435761, 5613197, 5664721, 5988449, 6218521

Offset

1,1

Links

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

Example

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

Crossrefs

Cf. A000326, A078972, A115680.

Sequence in context: A257631 A115682 A075523 * A337610 A109373 A373421

Adjacent sequences: A115676 A115677 A115678 * A115680 A115681 A115682

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Status

approved