A053891 Squares composed of digits {1,3,4}.

1, 4, 144, 441, 1444, 1411344, 431434441, 1441113444, 11414343334144, 134433311433444, 4334114143334143111441, 14431113411144114144433444, 331413131434411141441331411344, 444341333431434111311131411343131143441

Offset

1,2

Links

Zhao Hui Du, Table of n, a(n) for n = 1..15

Author?, Source(txt)

Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences

H. Mishima, Sporadic tridigital solutions

Formula

a(n) = A053890(n)^2.

Crossrefs

Cf. A053890.

Sequence in context: A083688 A053899 A058414 * A053897 A017294 A273698

Adjacent sequences: A053888 A053889 A053890 * A053892 A053893 A053894

Keyword

nonn,base

Author

Patrick De Geest, Mar 15 2000

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005

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

Two more terms from Mishima's page added by Max Alekseyev, Jan 28 2012

Status

approved