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A069697
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Triangular numbers with internal digits 5.
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0
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0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 153, 253, 351, 2556, 6555
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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COMMENTS
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For proof of finiteness see A069693.
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LINKS
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Table of n, a(n) for n=1..19.
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MATHEMATICA
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Do[ If[ Union[ Drop[ RotateLeft[ IntegerDigits[n(n + 1)/2]], -2]] == {5}, Print[n(n + 1)/2]], {n, 14, 2 10^6}]
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CROSSREFS
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Cf. A069675 to A069684, A069693 to A069700.
Sequence in context: A069693 A069694 A069695 * A069699 A213516 A078254
Adjacent sequences: A069694 A069695 A069696 * A069698 A069699 A069700
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KEYWORD
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nonn,base,fini,full
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 06 2002
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EXTENSIONS
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Extended by Robert G. Wilson v, Apr 07 2002
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STATUS
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approved
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