52665

Appears in sequences

• Wieferich numbers (1): n > 1 such that 2^A000010(n) == 1 (mod n^2).at n=11A077816
• Principal diagonal of the convolution array A213771.at n=29A213772
• Numbers m such that m^2 divides 2^k - 1 for some k, 0 < k <= m.at n=22A246503
• Numbers n > 1 such that 2^m == 1 (mod n^2), where m = A002326((n-1)/2).at n=10A265630
• Numbers n > 1 such that 2^lambda(n) == 1 (mod n^2), where lambda(n) is the Carmichael lambda function (A002322).at n=11A291961