A119188 Triangular numbers composed of digits {3,5,7}.

3, 55, 5735537337753, 53737577757753, 335355753333373553355, 573535753575353335777335733757755, 7357333757773777355335733737733553753

Offset

1,1

Comments

a(8) > 10^37. - Tyler Busby, Mar 24 2023

Links

Table of n, a(n) for n=1..7.

Giovanni Resta, Tridigital Triangular Numbers.

Formula

a(n) = A000217(A119189(n)). - Tyler Busby, Mar 24 2023

Crossrefs

Cf. A000217, A119189. See A119033 for a table of cross-references.

Sequence in context: A110058 A083869 A290773 * A111451 A285450 A280805

Adjacent sequences: A119185 A119186 A119187 * A119189 A119190 A119191

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(6)-a(7) from Tyler Busby, Mar 24 2023

Status

approved