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%I #7 Feb 11 2023 20:32:03
%S 4,9,4,9,16,25,36,9,64,81,100,25,144,169,16,49,256,289,324,81,64,441,
%T 484,25,576,625,676,169,784,121,900,225,100,1089,36,289,1296,1369,196,
%U 81,1600,169,1764,441,361,2025,2116,49,2304,2401,256,625,2704,2809,441
%N a(n) = smallest square in the arithmetic progression {nk+1 : k > 0}.
%F a(n)=Min{x^2 : x^2=nk+1}
%e Each square q appears in several progressions, i.e. in A000005(q-1) cases. Not necessarily as a first square. E.g. q=81 is minimal in {10k+1},{20k+1},{40k+1},{80k+1}, while not minimal in {3k+1} and 5 other progressions. In {16k+1} 49 comes before 81.
%K nonn
%O 1,1
%A _Labos Elemer_, Jun 08 2001
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