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A241787
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Triangular numbers which have one or more occurrences of exactly four different digits.
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7
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1035, 1275, 1326, 1378, 1485, 1540, 1596, 1653, 1830, 1953, 2016, 2145, 2346, 2415, 2485, 2701, 2850, 3081, 3160, 3240, 3486, 3570, 3741, 3916, 4095, 4186, 4278, 4371, 4560, 4753, 4851, 4950, 5460, 5671, 6105, 6328, 6903, 7021, 7140, 7260, 7381, 7503, 8256
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The first term having a repeated digit is 10153.
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LINKS
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Colin Barker, Table of n, a(n) for n = 1..2000
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MATHEMATICA
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Select[Accumulate[Range[200]], Count[DigitCount[#], 0]==6&] (* Harvey P. Dale, Jun 29 2022 *)
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PROG
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(PARI) s=[]; for(n=0, 300, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==4, s=concat(s, n*(n+1)/2))); s
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CROSSREFS
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Cf. A045914, A062691, A162304, A241788, A241789, A241790, A241791, A241792, A241812.
Cf. A000217.
Sequence in context: A236804 A023063 A245680 * A175692 A023087 A219445
Adjacent sequences: A241784 A241785 A241786 * A241788 A241789 A241790
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KEYWORD
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nonn,base
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AUTHOR
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Colin Barker, Apr 28 2014
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STATUS
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approved
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