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A119218
Triangular numbers composed of digits {5,6,7}.
2
6, 55, 66, 666, 5565, 6555, 5656566, 5676765, 6655776, 56567566, 575675766555, 677767555675, 555665666566566, 555667666766556, 5755656755766655, 565767676566675765, 7557657566575767666, 5555555666655656666556566566566
OFFSET
1,1
COMMENTS
a(19) > 10^40. - Tyler Busby, Mar 28 2023
FORMULA
a(n) = A000217(A119219(n)). - Michel Marcus, Mar 27 2023
CROSSREFS
Cf. A000217, A053969, A119219. See A119033 for a table of cross-references.
Sequence in context: A119164 A119079 A119220 * A085066 A085067 A069508
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(18) from Tyler Busby, Mar 28 2023
STATUS
approved