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A093844
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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.
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2
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1, 3, 17, 7, 1249, 15551, 235297, 419903, 86093441, 1999999999, 51874849201, 1486016741375, 46596170244961, 1587429546508287, 58385852050781249, 8191, 97322383751333736961, 4371823119477393063935, 208254700595822483065681
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OFFSET
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1,2
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COMMENTS
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1
1 3
1 9 17
1 3 5 7
1 313 625 937 1249
1 3111 6221 9331 12441 15551
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LINKS
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PROG
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(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)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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