A119082 Numbers k such that the k-th triangular number contains only digits {0,5,7}.

10, 100, 124, 375, 1000, 10000, 100000, 1000000, 3924474, 10000000, 100000000, 387492084, 1000000000, 3885885999, 10000000000, 31804089540, 39371996915, 100000000000, 122929061474, 1000000000000, 10000000000000

Offset

1,1

Links

Table of n, a(n) for n=1..21.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119081. See A119034 for a table of cross-references.

Sequence in context: A035504 A072366 A349316 * A116143 A208497 A207585

Adjacent sequences: A119079 A119080 A119081 * A119083 A119084 A119085

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved