A119174 Triangular numbers composed of digits {2,6,8}.

6, 28, 66, 666, 2628, 228826, 828828, 2222886, 66268828, 222868828, 286262628, 628262628, 688668828, 862266628, 2266226826, 622686668286628, 866688628826628, 68262228626828682628, 288626826822666288666, 66288228282628868868828, 28622882886686262262866288686266

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Giovanni Resta, Tridigital Triangular Numbers.

Formula

a(n) = A000217(A119175(n)). - Tyler Busby, Mar 28 2023

Crossrefs

Cf. A000217, A119175. See A119033 for a table of cross-references.

Sequence in context: A227970 A034955 A117978 * A326134 A343512 A326484

Adjacent sequences: A119171 A119172 A119173 * A119175 A119176 A119177

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Extensions

a(20)-a(21) from Tyler Busby, Mar 28 2023

Status

approved