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

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

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Comments

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

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

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

Formula

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

Extensions

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