A083406 Even squares which can be expressed as the product of a number and its reversal in at least two different ways.

63504, 435600, 6350400, 7683984, 16240900, 25401600, 43560000, 66585600, 420332004, 558471424, 635040000, 647804304, 726949444, 768398400, 782432784, 1067328900, 1624090000, 1897473600, 2341011456, 2540160000

Offset

1,1

Comments

For n=1..49 identical to A083408.

References

S. S. Gupta, EPRNs, Science Today, Feb. 1987, India.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..2372 (first 73 terms from Hans Havermann)

Shyam Sunder Gupta, Equal Product of Reversible Numbers

Example

63504 = 252 * 252 = 144 * 441, 7683984 = 2772 * 2772 = 1584 * 4851, etc.

Crossrefs

Cf. A031877, A066531, A083407 (odd squares version), A083408 (all squares version).

Sequence in context: A359872 A117282 A076750 * A083408 A325150 A072693

Adjacent sequences: A083403 A083404 A083405 * A083407 A083408 A083409

Keyword

nonn,base

Author

Shyam Sunder Gupta, Jun 07 2003

Extensions

Corrected and extended by Hans Havermann, Feb 11 2012

Definition corrected by N. J. A. Sloane, Aug 01 2019

Status

approved