A115695 - OEIS

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A115695

Powerful(1) numbers (A001694) whose digit reversal is a pentagonal number (A000326).

2

1, 100, 500, 529, 1000, 1089, 2116, 5000, 6241, 10000, 50000, 52900, 100000, 103041, 108900, 151875, 211600, 500000, 529000, 549152, 624100, 1000000, 1089000, 2116000, 5000000, 5290000, 6241000, 10000000

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..28.

Index entries for sequences related to powerful numbers

EXAMPLE

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

CROSSREFS

Cf. A000326, A001694, A115696.

Sequence in context: A017642 A093004 A003588 * A250700 A250846 A172518

Adjacent sequences: A115692 A115693 A115694 * A115696 A115697 A115698

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 31 2006

STATUS

approved