A053905 -id:A053905 - cp's OEIS frontend

A119136 Triangular numbers composed of digits {1,5,8}.

1, 15, 55, 5151, 8515, 581581, 885115, 1188111, 11188815, 51151555, 81581151, 88851115, 851585815, 8888511115, 888885111115, 88888851111115, 8888888511111115, 888888885111111115, 5885188811851888815, 15158585181118581555, 88888888851111111115

Offset: 1

Giovanni Resta, May 10 2006

Giovanni Resta, Tridigital Triangular Numbers

Cf. A000217, A053905, A119137. See A119033 for a table of cross-references.

a(n) = A000217(A119137(n)). - Michel Marcus, Mar 24 2023

a(20)-a(21) from Tyler Busby, Mar 23 2023

A053904 Numbers k such that k^2 contains only digits {1,5,8}.

Original entry on oeis.org

1, 9, 109, 296848141, 4341833151859, 3399291958357679641, 2412237158970509643109

Offset: 1

Patrick De Geest, Mar 15 2000

P. 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 21 2009]

Cf. A053905.

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

Two more terms from Mishima's webpage added by Max Alekseyev, May 21 2009

cp's OEIS Frontend

A119136 Triangular numbers composed of digits {1,5,8}.

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