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%I #4 Nov 05 2012 12:18:24
%S 0,4,38,1985,27493,390112,390112,96940388,3379649772,24306922095,
%T 450044583893,5597937117454,28673959190179,3524407382568745,
%U 13428985415474682,13428985415474682,5711417117604156904,91610966633729580058,6709533061724423693474
%N a(n) is smallest number such that a(n)^2 + 1 is divisible by 17^n.
%e a(4) = 27493 because 27493^2+1 = 2 * 5 ^ 2 * 17 ^ 4 * 181.
%t b=4;n17=17;jo=Join[{0,b},Table[n17=17*n17;b=PowerMod[b,17,n17];b=Min[b,n17-b],{99}]]
%Y Cf. A002522, A049532, A034939, A218709.
%K nonn
%O 0,2
%A _Michel Lagneau_, Nov 04 2012
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