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A119118 Numbers k such that the k-th triangular number contains only digits {1,3,7}. 2
1, 2, 18, 58, 1853, 5853, 1620578, 485216058, 1243473981, 2747265466, 595277030253, 789599540493, 2573455929746, 48450258487106 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Next term is greater than 4.4*10^18. - Max Alekseyev, Oct 15 2012
LINKS
CROSSREFS
Cf. A000217, A119117. See A119034 for a table of cross-references.
Sequence in context: A058794 A114109 A085293 * A213820 A078837 A232155
KEYWORD
nonn,base,more
AUTHOR
Giovanni Resta, May 10 2006
STATUS
approved

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Last modified September 8 01:34 EDT 2024. Contains 375749 sequences. (Running on oeis4.)