A031152 -id:A031152 - cp's OEIS frontend

A031154 Numbers k such that k^2 contains only digits {2,4,5}.

2, 5, 15, 65, 235, 665, 2132, 2335, 6515, 6665, 23335, 47162, 66515, 66665, 67485, 233335, 235065, 666515, 666665, 2333335, 6666515, 6666665, 23333335, 64980962, 66666515, 66666665, 233333335, 666666515, 666666665, 2333333335, 5044357665

Offset: 1

Patrick De Geest

Zhao Hui Du, Table of n, a(n) for n = 1..106
Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences
Author?, Source(txt)

Cf. A031152.

Extended and corrected by author Mar 15 2000

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005

A119158 Triangular numbers composed of digits {2,4,5}.

Original entry on oeis.org

45, 55, 25425, 255255, 22542255, 244525555, 2245524452445, 2445254445525, 5255545252454245, 444222245455224445, 4544525455555255444225, 5554545454254522254255544522452525245

Offset: 1

Giovanni Resta, May 10 2006

a(13) > 10^40.

G. Resta, Tridigital Triangular Numbers.

Cf. A000217, A031152, A119159. See A119033 for a table of cross-references.

a(n) = A000217(A119159(n)).

a(12) from Max Alekseyev, Aug 19 2013

cp's OEIS Frontend

A031154 Numbers k such that k^2 contains only digits {2,4,5}.

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