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A117281 Palindromes whose squares are EPRNs (A066531). 4
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 = 27972*27972 = 15984*48951.

1113111 is in the sequence because 1239016098321 = 1113111*1113111 = 1022121*1212201.

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 May 30 06:51 EDT 2017. Contains 287302 sequences.