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A119140 Triangular numbers composed of digits {1,6,7}. 2
1, 6, 66, 171, 666, 1176, 1711, 17766, 61776, 67161, 166176, 617716, 7767711, 61677171, 77171676, 161667171, 166777716, 611677776, 66767167176, 77111161116, 171676611666, 617617761166, 1116177116671, 161776717667666676, 1116166667661771771, 6667177116611677771 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A000217(A119141(n)). - Michel Marcus, Mar 22 2023
CROSSREFS
Cf. A000217, A053907, A119141. See A119033 for a table of cross-references.
Sequence in context: A101011 A292456 A292736 * A085025 A048537 A133424
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(24)-a(26) from Tyler Busby, Mar 22 2023
STATUS
approved

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Last modified May 18 11:53 EDT 2024. Contains 372630 sequences. (Running on oeis4.)