A117281 - OEIS

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A117281

Palindromes whose squares are EPRNs (A066531).

252, 2772, 20502, 23632, 25452, 26962, 27972, 48384, 225522, 252252, 259952, 279972, 619916, 1113111, 1226221, 1357531, 2005002, 2070702, 2126212, 2150512, 2216122, 2226222, 2249422, 2275722, 2316132, 2347432, 2386832, 2429242 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`S. S. Gupta (see link): "EPRNs (Equal Product of Reversible Numbers) are defined as the numbers which can be expressed as the product of two reversible numbers in (at least) two different ways".` `a(n)^2 = A083408(k) for some k.`
	LINKS	`Hans Havermann, Table of n, a(n) for n = 1..54` `Shyam Sunder Gupta, EPRNs`
	EXAMPLE	`27972 is in the sequence because 782432784 = 2797227972 = 1598448951.` `1113111 is in the sequence because 1239016098321 = 11131111113111 = 10221211212201.`
	CROSSREFS	`Cf. A066531, A083408 (square EPRNs), A206642.` `Sequence in context: A154073 A166783 A104679 * A152466 A004535 A027815` `Adjacent sequences: A117278 A117279 A117280 * A117282 A117283 A117284`
	KEYWORD	`nonn,base`
	AUTHOR	`Lekraj Beedassy, Apr 23 2006`
	EXTENSIONS	`Edited and corrected by Klaus Brockhaus, Aug 21 2007`
	STATUS	`approved`

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Last modified December 11 13:25 EST 2018. Contains 318049 sequences. (Running on oeis4.)