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A078256
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Triangular numbers in which frequency of occurrence of every digit is same.
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0
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0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 190, 210, 231, 253, 276, 325, 351, 378, 406, 435, 465, 496, 528, 561, 630, 666, 703, 741, 780, 820, 861, 903, 946, 1035, 1275, 1326, 1378, 1485, 1540, 1596, 1653, 1830, 1953, 2016, 2145
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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T[n_] := n*(n + 1)/2; f[n_] := Block[{dc = DigitCount[n], s}, s = Select[dc, Positive]; Min @@ s == Max @@ s]; Select[Array[T, 70, 0], f] (* Ray Chandler, May 11 2007 *)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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STATUS
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approved
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