A119195 Numbers k such that the k-th triangular number contains only digits {3,6,7}.

2, 3, 8, 11, 36, 391, 816, 8563, 39183, 2594751, 12436829803183

Offset

1,1

Comments

Next term exceeds 1.4*10^16.

Links

Table of n, a(n) for n=1..11.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119194. See A119034 for a table of cross-references.

Sequence in context: A317912 A096506 A119155 * A119199 A119197 A119185

Adjacent sequences: A119192 A119193 A119194 * A119196 A119197 A119198

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Status

approved