A119111 Triangular numbers composed of digits {1,3,4}.

1, 3, 1431, 33411, 331441131, 1444343131, 13113334431, 31444341333441, 111413314441131, 444334341314331, 11114441143333344141, 331341331134344133331, 4443314433131433343331311434133434431331

Offset

1,2

Comments

a(14) > 10^41. - Tyler Busby, Mar 27 2023

Links

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

Giovanni Resta, Tridigital Triangular Numbers.

Formula

a(n) = A000217(A119112(n)). - Tyler Busby, Mar 27 2023

Crossrefs

Cf. A000217, A053891, A119112. See A119033 for a table of cross-references.

Sequence in context: A036066 A262516 A060307 * A233195 A219783 A264427

Adjacent sequences: A119108 A119109 A119110 * A119112 A119113 A119114

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(13) from Tyler Busby, Mar 27 2023

Status

approved