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A119118 Numbers n such that the n-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

Table of n, a(n) for n=1..14.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119117. See A119034 for a table of cross-references.

Sequence in context: A058794 A114109 A085293 * A213820 A078837 A232155

Adjacent sequences:  A119115 A119116 A119117 * A119119 A119120 A119121

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified June 24 21:16 EDT 2019. Contains 324337 sequences. (Running on oeis4.)