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A218398
Numbers k such that the k-th triangular number contains only digits {0,2,7}.
2
374184, 7385400, 203569507673559, 6663335616682084400
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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
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Last modified September 16 18:59 EDT 2024. Contains 375977 sequences. (Running on oeis4.)