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A119093
Triangular numbers composed of digits {0,7,8}.
2
78, 780, 8778, 887778, 88877778, 870800778, 7007800078, 8008780080, 8888777778, 770800800078, 888887777778, 70870887770880, 88888877777778, 7808778880700878, 8888888777777778, 888888887777777778, 70888000778807080078, 88888888877777777778
OFFSET
1,1
FORMULA
a(n) = A000217(A119094(n)). - Tyler Busby, Mar 31 2023
CROSSREFS
Cf. A000217, A119094. See A119033 for a table of cross-references.
Sequence in context: A129238 A297759 A147619 * A128951 A370209 A272383
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(17)-a(18) from Tyler Busby, Mar 23 2023
STATUS
approved