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Search: id:A113796
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| A113796 |
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Numbers n such that n=T(x)+T(y) where T(k) is the k-th triangular number and n is x concatenated y in base 10. |
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+0
1
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| 190, 191, 19900, 19901, 90415, 585910, 1201545, 1414910, 1501726, 1909415, 1999000, 1999001, 2442196, 7003676, 7693846, 14745226, 28296970, 30307171, 42009156, 47748526, 61549231, 63249300, 78049756, 82749850, 84559880
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OFFSET
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1,1
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EXAMPLE
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90415=T(90)+T(415)
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MATHEMATICA
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lst = {}; t[n_] := n(n + 1)/2; Do[p=10; While[n > p, If[t[Mod[n, p]] + t[Floor[n/p]] == n, AppendTo[lst, n]]; p*= 10], {n, 10^6}]; lst
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CROSSREFS
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Sequence in context: A118878 A036208 A119903 this_sequence A127994 A025391 A025382
Adjacent sequences: A113793 A113794 A113795 this_sequence A113797 A113798 A113799
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KEYWORD
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base,nonn
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AUTHOR
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Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 21 2006
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