Geodesic
On Obláth's problem
Journal of integer sequences, Tome 6 (2003) no. 3.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: In this paper we determine those squares whose decimal representation consists of $k >= 2$ digits such that $k-1$ of them equal. Full version: pdf, dvi, ps, latex
Classification : 11A63, 11D09, 11D61
Keywords: square, equal digits, pell equation (Concerned with sequence 1 
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     author = {Gica, Alexandru and Panaitopol, Lauren\c{t}iu},
     title = {On {Obl\'ath's} problem},
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Gica, Alexandru; Panaitopol, Laurenţiu. On Obláth's problem. Journal of integer sequences, Tome 6 (2003) no. 3. http://geodesic.mathdoc.fr/item/JIS_2003__6_3_a7/