A053901 -id:A053901 - cp's OEIS frontend

A053900 Numbers k such that k^2 contains only digits {1,4,8}.

1, 2, 9, 12, 21, 22, 29, 38, 109, 122, 221, 1191, 20359, 12017441, 64352012, 69362229, 105741122, 1347014779, 10715008859, 664190348029, 940313186572, 4263966676478, 34479242283029, 1055656895701022, 2968363385585478

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
H. Mishima, Squares consisted of 3 different digits [From _Max Alekseyev_, May 29 2009]

Cf. A053901.

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
Two more terms from Jon E. Schoenfield, Sep 03 2006
Further terms from Mishima's webpage added by Max Alekseyev, May 29 2009

A119128 Triangular numbers composed of digits {1,4,8}.

Original entry on oeis.org

1, 114481, 1188111, 11841411, 488184144441, 8888818418481, 114841884884181, 144118118141481, 484118414411448411, 141488881884888144481881, 148418181848481418444484488141, 141848488814448448184488111481811, 8114481418814448448488484488444141

Offset: 1

Giovanni Resta, May 10 2006

a(14) > 10^40. - Tyler Busby, Mar 28 2023

Giovanni Resta, Tridigital Triangular Numbers.

Cf. A000217, A053901, A119129. See A119033 for a table of cross-references.

a(n) = A000217(A119129(n)). - Tyler Busby, Mar 28 2023

a(12)-a(13) from Max Alekseyev, Aug 16 2013

cp's OEIS Frontend

A053900 Numbers k such that k^2 contains only digits {1,4,8}.

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