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A221265
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Numbers having more distinct prime factors of form 4*k+1 than of 4*k+3.
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5
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5, 10, 13, 17, 20, 25, 26, 29, 34, 37, 40, 41, 50, 52, 53, 58, 61, 65, 68, 73, 74, 80, 82, 85, 89, 97, 100, 101, 104, 106, 109, 113, 116, 122, 125, 130, 136, 137, 145, 146, 148, 149, 157, 160, 164, 169, 170, 173, 178, 181, 185, 193, 194, 195, 197, 200, 202
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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mdpf1Q[n_]:=Module[{f=Transpose[FactorInteger[n]][[1]]}, Count[f, _?(Mod[ #, 4] == 1&)]>Count[f, _?(Mod[#, 4]==3&)]]; Select[Range[2, 250], mdpf1Q] (* Harvey P. Dale, Mar 03 2016 *)
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PROG
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(Haskell)
a221265 n = a221265_list !! (n-1)
a221265_list = filter ((> 0) . a005094) [1..]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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