A377026 Numbers k such that 2^(2^k+1) == -1 (mod k^2).
1, 3, 9, 171, 3249, 97641, 1855179, 29884473, 55753011, 567804987, 892145817, 1059307209
Offset: 1
Crossrefs
Subsequence of A006521.
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