68813

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 40.at n=5A031628
• Primes p = prime(k) of form 13//r, s//13 or t//13//u and sod(p) = sod(k).at n=34A169645
• Number of 0..6 arrays x(0..n-1) of n elements with zero n-1st difference.at n=8A200152
• Primes of the form floor(Pi*k^2).at n=18A227794
• Primes p such that p+8, p+86, p+864 are prime.at n=34A236302
• Prime numbersat n=6839