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

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

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..13.

Giovanni Resta, Tridigital Triangular Numbers.

Formula

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

Crossrefs

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

Sequence in context: A221334 A069371 A143725 * A276100 A233732 A254494

Adjacent sequences: A119125 A119126 A119127 * A119129 A119130 A119131

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Extensions

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

Status

approved