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A218401
Triangular numbers composed of digits {0,7,9}.
2
990, 90779090007770790, 79909779970709079970099779979097777700
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OFFSET
1,1
COMMENTS
a(4) > 10^40.
LINKS
Table of n, a(n) for n=1..3.
Giovanni Resta,
Tridigital Triangular Numbers
.
FORMULA
a(n) =
A000217
(
A218402
(n)).
CROSSREFS
Cf.
A000217
,
A218402
. See
A119033
for a table of cross-references.
Sequence in context:
A119095
A119077
A119057
*
A053393
A365598
A031790
Adjacent sequences:
A218398
A218399
A218400
*
A218402
A218403
A218404
KEYWORD
base
,
nonn
,
more
,
hard
,
bref
AUTHOR
Max Alekseyev
, Oct 28 2012
STATUS
approved
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Last modified March 30 04:14 EDT 2024. Contains 371289 sequences. (Running on oeis4.)