A115679 - OEIS

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A115679

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

1

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

(list; graph; refs; listen; history; text; internal format)

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