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

Author

Shyam Sunder Gupta, Jun 07 2003

Keywords

• nonn
• base

Comments

For n=1..49 identical to A083408.

Examples

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

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

Crossrefs

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

Extensions

Corrected and extended by Hans Havermann, Feb 11 2012

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