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

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

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

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

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

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

Formula

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

Extensions

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