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A122985 Smallest composite number greater than n, relatively prime to n, such that a(n)-n is also composite. 2

%I

%S 9,27,25,25,9,55,15,33,25,49,15,77,21,39,49,25,21,95,25,69,25,49,27,

%T 49,33,35,35,55,33,121,35,57,49,49,39,85,45,63,49,49,45,185,49,65,49,

%U 55,51,125,55,77,55,77,57,119,63,65,65,85,63,203,65,77,85,85,69,91,75,77,77

%N Smallest composite number greater than n, relatively prime to n, such that a(n)-n is also composite.

%t scn[n_]:=Module[{k=n+1},While[!CompositeQ[k]||!CoprimeQ[n,k] || !CompositeQ[ k-n],k++];k]; Array[scn,70] (* _Harvey P. Dale_, Jul 26 2019 *)

%Y Equals A122984(n) + n. Cf. A096076.

%K easy,nonn

%O 1,1

%A _Franklin T. Adams-Watters_, Sep 22 2006

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Last modified May 14 22:40 EDT 2021. Contains 343909 sequences. (Running on oeis4.)