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A119200
Triangular numbers composed of digits {3,7,8}.
2
3, 78, 378, 8778, 887778, 88877778, 8787733878, 8888777778, 73778888778, 888887777778, 8883333788878, 37383337333378, 88888877777778, 8888888777777778, 888888887777777778, 88888888877777777778, 8888888888777777777778, 887783783833373788333378
OFFSET
1,1
FORMULA
a(n) = A000217(A119201(n)). - Tyler Busby, Mar 24 2023
CROSSREFS
Cf. A000217, A119201. See A119033 for a table of cross-references.
Sequence in context: A324307 A065993 A097802 * A197888 A301394 A271182
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(17)-a(18) from Tyler Busby, Mar 24 2023
STATUS
approved