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A117281
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Palindromes whose squares are EPRNs (A066531).
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1
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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; internal format)
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OFFSET
| 1,1
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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.
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LINKS
| Hans Havermann, Table of n, a(n) for n = 1..54
Shyam Sunder Gupta, EPRNs
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EXAMPLE
| 27972 is in the sequence because 782432784 = 27972*27972 = 15984*48951.
1113111 is in the sequence because 1239016098321 = 1113111*1113111 = 1022121*1212201.
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CROSSREFS
| Cf. A066531, A083408 (square EPRNs), A206642.
Sequence in context: A154073 A166783 A104679 * A152466 A004535 A027815
Adjacent sequences: A117278 A117279 A117280 * A117282 A117283 A117284
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KEYWORD
| nonn,base,changed
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Apr 23 2006
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EXTENSIONS
| Edited and corrected by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 21 2007
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