A218398 Numbers k such that the k-th triangular number contains only digits {0,2,7}.

374184, 7385400, 203569507673559, 6663335616682084400

Offset

1,1

Comments

No other terms below 1.4*10^20.

Links

Table of n, a(n) for n=1..4.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A218397. See A119034 for a table of cross-references.

Sequence in context: A206666 A296815 A147770 * A089444 A203740 A283030

Adjacent sequences: A218395 A218396 A218397 * A218399 A218400 A218401

Keyword

base,nonn,more

Author

Max Alekseyev, Oct 28 2012

Status

approved