A119167 Numbers k such that the k-th triangular number contains only digits {2,5,7}.

10, 74, 714, 1074, 1070285, 2270474, 1206047449, 67189697949, 324723752049, 23346424812260967349

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119166. See A119034 for a table of cross-references.

Sequence in context: A279284 A264082 A103434 * A233100 A266674 A233455

Adjacent sequences: A119164 A119165 A119166 * A119168 A119169 A119170

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(10) from Tyler Busby, Mar 31 2023

Status

approved