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%I #5 Dec 05 2013 19:56:48
%S 1,3,17,7,1249,15551,235297,419903,86093441,1999999999,51874849201,
%T 1486016741375,46596170244961,1587429546508287,58385852050781249,8191,
%U 97322383751333736961,4371823119477393063935,208254700595822483065681
%N n-th row of the following triangle contains n terms of an arithmetic progression with the first term 1 such that the sum is the least possible n-th power. Sequence contains the leading diagonal.
%C 1
%C 1 3
%C 1 9 17
%C 1 3 5 7
%C 1 313 625 937 1249
%C 1 3111 6221 9331 12441 15551
%o (PARI) {a(n)=local(k);k=2;while(2*Mod(k,n)^n!=0||2*(Mod(k,n-1)^n-1)!=0,k++);2*k^n/n-1} (Alekseyev)
%Y Cf. A093460, A093845.
%Y Cf. A093845, A110500.
%K nonn
%O 1,2
%A _Amarnath Murthy_, Apr 18 2004
%E More terms from _Max Alekseyev_, Jul 23 2005
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