A119189 Numbers k such that the k-th triangular number contains only digits {3,5,7}.

2, 10, 3386897, 10367022, 25898098514, 33868444120607410, 3835970218282143377

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119188. See A119034 for a table of cross-references.

Sequence in context: A027735 A085698 A057095 * A309862 A260756 A252707

Adjacent sequences: A119186 A119187 A119188 * A119190 A119191 A119192

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(6)-a(7) from Tyler Busby, Mar 31 2023

Status

approved