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A197169 Values of gcd(n,y) for successive y = A197128(n). 1

%I #10 Aug 02 2019 23:04:33

%S 2,2,2,2,2,2,2,46,2,2,2,2,3,10,6,2,3,3,2,2,2,6,5,2,2,5,2,2,2,2,2,2,22,

%T 5,2,2,3,2,2,3,2,2,3,46,5,2,2,2,2,2,2,2,2,2,2,2,14,2,4,3,2,2,2,4,14,3,

%U 2,3,2,5,2,2,2,5,2,2,2,3,6,29,3,2,2,3

%N Values of gcd(n,y) for successive y = A197128(n).

%t cr = {}; Do[If[IntegerQ[Sqrt[n]], , kk = NumberFieldFundamentalUnits[Sqrt[n]]; d1 = kk[[1]][[2]][[1]]; d2 = kk[[1]][[1]] kk[[1]][[2]][[2]]; d4 = Numerator[d2/Sqrt[n]]; If[GCD[d4, n] == 1, , AppendTo[cr, GCD[d4, n]]]], {n, 2, 20000}]; cr

%Y Cf. A087643, A172000, A194366, A197115, A197127, A197128.

%K nonn

%O 1,1

%A _Artur Jasinski_, Oct 11 2011

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Last modified April 25 12:33 EDT 2024. Contains 371969 sequences. (Running on oeis4.)