A115691 Powerful(1) numbers (A001694) whose digit reversal is a triangular number.

1, 100, 1000, 5400, 10000, 54000, 100000, 540000, 1000000, 1306449, 1728243, 5400000, 10000000, 50086125, 54000000, 100000000, 130644900, 172824300, 540000000, 1000000000, 1044000721, 1306449000, 1728243000, 5008612500

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Index entries for sequences related to powerful numbers

Example

5400=2^3*3^3*5^2 is powerful and 45=T(9).

Crossrefs

Cf. A001694, A115692.

Sequence in context: A326638 A284515 A068086 * A066432 A173485 A173484

Adjacent sequences: A115688 A115689 A115690 * A115692 A115693 A115694

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Extensions

a(14)-a(24) from Donovan Johnson, Oct 01 2009

Status

approved