A071823 Number of numbers x <= n with largest prime factor of the form 4k+3.
0, 0, 1, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 7, 7, 7, 8, 9, 9, 10, 11, 12, 13, 13, 13, 14, 15, 15, 15, 16, 16, 17, 17, 18, 19, 19, 20, 20, 20, 20, 21, 22, 23, 23, 24, 25, 26, 27, 27, 27, 27, 27, 28, 29, 30, 31, 31, 32, 32, 32, 33, 34, 34, 34, 35, 36, 36, 37, 38, 39, 40, 40, 40, 40, 41
Offset: 1
Programs
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Mathematica
Accumulate[Table[If[Mod[FactorInteger[n][[-1,1]],4]==3,1,0],{n,80}]] (* Harvey P. Dale, Jun 29 2017 *) -
PARI
for(n=2,200,print1(sum(i=2,n,if((component(component(factor(i),1),omega(i))-3)%4,0,1)),","))
Extensions
Zero prepended by Harvey P. Dale, Jun 29 2017
Comments