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A119078
Numbers k such that the k-th triangular number contains only digits {0,4,9}.
2
44, 2831780, 1407437419, 140715344155
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OFFSET
1,1
COMMENTS
Next term exceeds 1.4*10^16.
LINKS
Table of n, a(n) for n=1..4.
G. Resta,
Tridigital Triangular Numbers
CROSSREFS
Cf.
A000217
,
A119077
. See
A119034
for a table of cross-references.
Sequence in context:
A277840
A172828
A115734
*
A172878
A001782
A172910
Adjacent sequences:
A119075
A119076
A119077
*
A119079
A119080
A119081
KEYWORD
nonn
,
base
,
more
AUTHOR
Giovanni Resta
, May 10 2006
STATUS
approved
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Last modified September 16 03:28 EDT 2024. Contains 375959 sequences. (Running on oeis4.)