A119065 Triangular numbers composed of digits {0,3,7}.

3, 300, 703, 3003, 300700, 7777333333770, 30770737700703, 7707033303703300, 77300377037737303073770, 3073770307037370707370300003, 33000770070773300000703773730, 770037773370037377077730333003

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Comments

a(13) > 10^41. - Tyler Busby, Mar 28 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119066. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119066(n)). - Tyler Busby, Mar 28 2023