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A344602
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Integers whose Hamming weight is triangular.
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2
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0, 1, 2, 4, 7, 8, 11, 13, 14, 16, 19, 21, 22, 25, 26, 28, 32, 35, 37, 38, 41, 42, 44, 49, 50, 52, 56, 63, 64, 67, 69, 70, 73, 74, 76, 81, 82, 84, 88, 95, 97, 98, 100, 104, 111, 112, 119, 123, 125, 126, 128, 131, 133, 134, 137, 138, 140, 145, 146, 148, 152, 159, 161
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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MAPLE
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q:= n-> issqr(8*add(i, i=Bits[Split](n))+1):
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MATHEMATICA
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Select[Range[0, 200], IntegerQ @ Sqrt[8 * Plus @@ IntegerDigits[#, 2] + 1] &] (* Amiram Eldar, May 24 2021 *)
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PROG
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(PARI) isok(n) = ispolygonal(hammingweight(n), 3);
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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