52981

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 51.at n=1A031639
• Primes of the form 7n^2 - 2.at n=17A201848
• Number of (n+1) X (6+1) 0..1 arrays with every 2 X 2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically.at n=21A253395
• Primes of the form n^2 + 81.at n=22A256775
• Number T(n,k) of colored compositions of n using all colors of a k-set such that all parts have different color patterns and the patterns for parts i are sorted and have i colors in (weakly) increasing order; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=48A327244
• Primes p such that 65535*p is not of the form q + 2^a + 2^b with a, b > 0 and q prime.at n=1A332100
• Prime numbersat n=5407