A053885 Squares composed of digits {1,2,7}.

1, 121, 2217121, 21127711127121, 17177711172112177722222121, 17117772217211221211117217772227121

Offset: 1

Author

Patrick De Geest, Mar 15 2000

Keywords

• nonn
• base
• more

Comments

The least significant, i.e., rightmost, digit must be 1. - Harvey P. Dale, Jan 05 2022

Links

• P. De Geest, Squares containing at most three distinct digits, Index entries for related sequences
• Hisanori Mishima, Sporadic tridigital solutions

Crossrefs

Cf. A053884.

Extensions

One more term from Jon E. Schoenfield, Sep 03 2006

One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 23 2007