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A119205
Numbers k such that the k-th triangular number contains only digits {4,5,7}.
2
9, 10, 3390, 38589, 12453549, 3080826336474, 298253071929010, 33089502135135685
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..8.
Giovanni Resta,
Tridigital Triangular Numbers
.
CROSSREFS
Cf.
A000217
,
A119204
. See
A119034
for a table of cross-references.
Sequence in context:
A042191
A042729
A156292
*
A119207
A165254
A058069
Adjacent sequences:
A119202
A119203
A119204
*
A119206
A119207
A119208
KEYWORD
nonn
,
base
,
more
AUTHOR
Giovanni Resta
, May 10 2006
EXTENSIONS
a(8) from
Tyler Busby
, Mar 31 2023
STATUS
approved
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Last modified August 29 21:13 EDT 2024. Contains 375518 sequences. (Running on oeis4.)