A053911 -id:A053911 - cp's OEIS frontend

A053910 Numbers k such that k^2 contains only digits {1,6,9}.

1, 3, 4, 13, 14, 31, 263, 264, 3114, 4119, 24737, 81619, 834386, 1382737, 9959514, 10775719, 341608987, 836460469, 998053937, 24737858031, 40201507014, 99599046013, 2488372283063, 8361615872313

Offset: 1

Patrick De Geest, Mar 15 2000

Zhao Hui Du, Table of n, a(n) for n = 1..31
Author?, Source(txt)
Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences

Cf. A053911.

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

Two more terms from Jon E. Schoenfield, Sep 03 2006

A119144 Triangular numbers composed of digits {1,6,9}.

Original entry on oeis.org

1, 6, 66, 91, 666, 961191, 996166, 1191196, 96111966961, 99119996661, 16161696119661, 196999111911966, 661969169911666, 11961669169169616, 19961691661699161, 991961666199161911, 6116119911196616916, 16961161696691611916961, 911666691991111199916696

Offset: 1

Giovanni Resta, May 10 2006

Giovanni Resta, Tridigital Triangular Numbers

Cf. A000217, A053911, A119145. See A119033 for a table of cross-references.

a(n) = A000217(A119145(n)). - Michel Marcus, Mar 24 2023

a(18)-a(19) from Tyler Busby, Mar 24 2023

cp's OEIS Frontend

A053910 Numbers k such that k^2 contains only digits {1,6,9}.

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