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Search: id:A117281
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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; listen)
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OFFSET
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1,1
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COMMENT
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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 two different ways".
Further terms are 2453542, 2520252, 2545452, 2774772, 2799972, 3339333, 4229224. a(n)^2 = A083408(k) for some k.
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LINKS
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Shyam Sunder Gupta, EPRNs
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EXAMPLE
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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
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Cf. A066531, A083408 (square EPRNs).
Sequence in context: A154073 A166783 A104679 this_sequence A152466 A004535 A027815
Adjacent sequences: A117278 A117279 A117280 this_sequence A117282 A117283 A117284
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KEYWORD
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nonn,base
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Apr 23 2006
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EXTENSIONS
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Edited and corrected by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 21 2007
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