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 #3 Mar 31 2012 10:22:02
%S 5,5,13,29,61,2097143,1679609,509,1021,8589934583,4093,67108859,16381,
%T 470184984569,4294967291,2218611106740436979,68719476731,
%U 1350851717672992079,1048573,10460353199,4194301,20013311644049280264138724244295359,16777213,108347059433883722041830239,20282409603651670423947251285999,58149737003040059690390159,72057594037927931,536870909,999999999999999999999999999989
%N Least prime of the form x^n-x-1.
%t a = {}; Do[k = 2; While[ ! PrimeQ[k^n -k - 1], k++ ]; AppendTo[a, k^n - k - 1], {n, 2, 30}]; a (*Artur Jasinski*)
%Y Cf. A002327, A002328, A116581, A126420, A126421, A126422, A126423, A126424, A126425, A126426, A126427, A126427, A126428, A126429, A126430, A126431, A126432 A126433, A126434, A126435, A126436, A126437, A126438.
%K nonn
%O 2,1
%A _Artur Jasinski_, Dec 26 2006, Jan 19 2007