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A119047
Triangular numbers composed of digits {0,1,9}.
2
1, 10, 91, 190, 990, 10011, 19110, 19900, 90100, 1911990, 1991010, 1999000, 99991011, 199110990, 199910010, 199990000, 901999101, 1000900911, 1111019091, 19991100990, 19999100010, 19999900000, 1999911000990, 1999991000010, 1999999000000, 11109109109010
OFFSET
1,2
FORMULA
a(n) = A000217(A119048(n)). - Michel Marcus, Mar 14 2023
CROSSREFS
Cf. A000217, A119048. See A119033 for a table of cross-references.
Sequence in context: A043088 A175710 A226389 * A143572 A365305 A244203
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(24)-a(26) from Tyler Busby, Mar 14 2023
STATUS
approved