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A119144 Triangular numbers composed of digits {1,6,9}. 2
1, 6, 66, 91, 666, 961191, 996166, 1191196, 96111966961, 99119996661, 16161696119661, 196999111911966, 661969169911666, 11961669169169616, 19961691661699161, 991961666199161911, 6116119911196616916, 16961161696691611916961, 911666691991111199916696 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..19.
Giovanni Resta, Tridigital Triangular Numbers
FORMULA
a(n) = A000217(A119145(n)). - Michel Marcus, Mar 24 2023
CROSSREFS
Cf. A000217, A053911, A119145. See A119033 for a table of cross-references.
Sequence in context: A372547 A122780 A153514 * A153087 A117794 A101011
Adjacent sequences: A119141 A119142 A119143 * A119145 A119146 A119147
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(18)-a(19) from Tyler Busby, Mar 24 2023
STATUS
approved

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Last modified May 16 03:59 EDT 2024. Contains 372549 sequences. (Running on oeis4.)