63445

Appears in sequences

• Number of binary sequences of length n with an even number of ones, at least two of the ones being contiguous.at n=16A027711
• Denominators of continued fraction convergents to sqrt(281).at n=12A041529
• Let p(n) be the n-th prime congruent to 1 mod 4. Then a(n) = the least k for which m^2+1=p(n)*k^2 has a solution.at n=27A094049
• Smallest integer y satisfying the Pell equation x^2 - n*y^2 = -1 for the values of n given in A031396.at n=50A130227
• Determinant of the (p_n-1)/2 X (p_n-1)/2 matrix with (i,j)-entry being the Legendre symbol ((j-i)/p_n), where p_n is the n-th prime.at n=58A228077
• Numbers k such that 1 + 2^k + 3^k + 5^k is prime.at n=3A268067
• Numbers k such that A339549(k) = A339549(k+1).at n=33A339550