A119206 Triangular numbers composed of digits {4,5,8}.

45, 55, 48555585, 84844484544485445, 44585455858455488585854455, 445544585455555888554444445, 455888444844584444558845455, 5858855485848545848448855845485

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

a(9) > 10^40. - Tyler Busby, Mar 29 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053953, A119207. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119207(n)). - Jon E. Schoenfield, Mar 27 2023