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Search: id:A078795
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| A078795 |
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Concatenate first n triangular numbers. |
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+0
6
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| 1, 13, 136, 13610, 1361015, 136101521, 13610152128, 1361015212836, 136101521283645, 13610152128364555, 1361015212836455566, 136101521283645556678, 13610152128364555667891
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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There are only 2 primes i.e. 13 and 136101521 known in the sequence for first 1000 terms of the sequence.
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REFERENCES
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Shyam Sunder Gupta, Smarandache Sequence of Triangular Numbers, Smarandache Notions Journal, (to appear in Vol. 14, 2003).
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LINKS
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M. L. Perez et al., eds., Smarandache Notions Journal
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EXAMPLE
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a(3)=136 because 1, 3, 6 are first 3 triangular numbers.
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MATHEMATICA
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Table[FromDigits[Flatten[IntegerDigits[Table[n*(n+1)/2, {n, 1, m}]]]], {m, 1, 20}]
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CROSSREFS
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Sequence in context: A069511 A052262 A065550 this_sequence A123299 A142017 A046278
Adjacent sequences: A078792 A078793 A078794 this_sequence A078796 A078797 A078798
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KEYWORD
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base,easy,nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jan 10 2003
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