A156317 - OEIS

A156317

Numbers which are perfect squares and either form equal or larger perfect squares when reversed

0, 1, 4, 9, 121, 144, 169, 484, 676, 1089, 10201, 10404, 10609, 12321, 12544, 12769, 14641, 14884, 40804, 44944, 69696, 94249, 698896, 1002001, 1004004, 1006009, 1022121, 1024144, 1026169, 1042441, 1044484, 1062961, 1214404, 1216609

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OFFSET

1,3

COMMENTS

Subsequence of A061457 (similar definition but without the "equal or larger" condition). - Michel Marcus, Apr 25 2015

LINKS

Table of n, a(n) for n=1..34.

Martianus Frederic Ezerman, Bertrand Meyer and Patrick Solé, On Polynomial Pairs of Integers, arXiv:1210.7593. 2012. - From N. J. A. Sloane, Nov 08 2012

Martianus Frederic Ezerman, Bertrand Meyer and Patrick Solé, On Polynomial Pairs of Integers, Journal of Integer Sequences, Vol. 18 (2015), Article 15.3.5.

PROG

(PARI) lista(nn) = {for (n=0, nn, sq = n^2; if (issquare(r=subst(Polrev(digits(sq)), x, 10)) && (r >= sq), print1(sq, ", ")); ); } \\ Michel Marcus, Apr 25 2015

CROSSREFS

Cf. A061457.

Sequence in context: A230743 A367075 A033294 * A115676 A115667 A229971

Adjacent sequences: A156314 A156315 A156316 * A156318 A156319 A156320

KEYWORD

nonn,base

AUTHOR

Gaurav Kumar, Feb 07 2009

EXTENSIONS

Offset changed to 1 by Michel Marcus, Apr 25 2015

STATUS

approved