A119168 Triangular numbers composed of digits {2,5,8}.

28, 55, 528, 255255, 525825, 828828, 22528828, 58855825, 88252255, 285258555, 252852582885, 255285258288528, 255828252825225, 825882525828828, 255888285855228855, 555888585855288828885, 55255285258252252552225, 282882828558888582552522225, 528225588525528822525588858528585

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053927, A119169. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119169(n)). - Tyler Busby, Mar 28 2023

Extensions

a(18)-a(19) from Tyler Busby, Mar 28 2023