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A283776
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Numbers k such that floor(k*sqrt(3)) is odd.
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2
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1, 2, 3, 8, 9, 10, 11, 15, 16, 17, 18, 23, 24, 25, 26, 30, 31, 32, 33, 38, 39, 40, 41, 45, 46, 47, 48, 53, 54, 55, 60, 61, 62, 63, 68, 69, 70, 75, 76, 77, 78, 83, 84, 85, 90, 91, 92, 93, 98, 99, 100, 105, 106, 107, 108, 112, 113, 114, 115, 120, 121, 122, 123
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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a(n+1) - a(n) is in {1,4,5} for every n.
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MATHEMATICA
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r = Sqrt[3]; z = 350; t = Table[Floor[n*r], {n, 1, z}]; u = Mod[t, 2];
Flatten[Position[u, 0]] (* A283775 *)
Flatten[Position[u, 1]] (* A283776 *)
Select[Range[200], OddQ[Floor[# Sqrt[3]]]&] (* Harvey P. Dale, Nov 20 2020 *)
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PROG
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(PARI) for(n=1, 125, if(floor(n*sqrt(3))%2==1, print1(n, ", "))) \\ Indranil Ghosh, Mar 21 2017
(Python)
import math
from sympy import sqrt
print([n for n in range(1, 126) if int(math.floor(n*sqrt(3)))%2==1]) # Indranil Ghosh, Mar 21 2017
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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