41542

Appears in sequences

• Numbers k such that 5^k mod k = 5^k mod k^2.at n=43A125775
• a(n) = n^3 + 73*n^2 + n + 67.at n=21A163303
• Numbers n such that 5^A000010(n) == 1 (mod n^2).at n=3A242959
• a(n) = smallest composite c such that n^(A000010(c)) == 1 (mod c^2), i.e., smallest composite Wieferich number to base n.at n=4A247154
• a(n) = [x^n] 2^(2*n) / Product_{k>=1} (1-x^k)^(2^(-k)).at n=8A256105
• a(1) = 0 and a(n+1) > a(n) is the smallest integer such that a(n+1)^2-a(n)^2 is triangular.at n=24A358416