1,1

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.

Hans Havermann, Table of n, a(n) for n = 1..54

Shyam Sunder Gupta, EPRNs

27972 is in the sequence because 782432784 = 27972*27972 = 15984*48951.

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

Cf. A066531, A083408 (square EPRNs), A206642.

Sequence in context: A154073 A166783 A104679 * A152466 A004535 A027815

Adjacent sequences: A117278 A117279 A117280 * A117282 A117283 A117284

nonn,base

Lekraj Beedassy, Apr 23 2006

Edited and corrected by Klaus Brockhaus, Aug 21 2007

approved