Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Aug 03 2014 14:01:34
%S 3,14,31,24,23,160,225,56,171,186,53,144,235,74,591,120,5,390,51,26,
%T 189,204,77,696,21,308,13,528,149,1848,519,38,2053,48,131,544,1155,
%U 176,141,480,83,474,1437,656,2041,168,203,258,2193,50,1249,534,11,3276,111
%N Least k such that x^6 + k produces composite numbers for x=1..n and prime for x=n+1.
%t Table[k = 0; While[! (Union[PrimeQ[Range[n]^6 + k]] == {False} && PrimeQ[(n + 1)^6 + k]), k++]; k, {n, 55}] (* _T. D. Noe_, Oct 19 2011 *)
%Y Cf. A197955.
%K nonn
%O 1,1
%A _Arkadiusz Wesolowski_, Oct 19 2011