24952

Appears in sequences

• Numbers k such that 1000k+1, 1000k+3, 1000k+7, 1000k+9 are all primes.at n=11A064962
• Numbers k such that k^3 contains a pandigital substring.at n=24A115933
• a(n) = p(n+1)^2 + 2*p(n) + 1; p(n) is the n-th prime number and n >= 1.at n=35A155819
• G.f. satisfies: A(x) = Product_{n>=1} (1 + x^n*A(x))^2/((1-x^n)*(1 - x^n*A(x)^2)).at n=5A192625
• Number of nX6 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 0 and 1 1 1 vertically.at n=6A207877
• Number of nX7 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 0 and 1 1 1 vertically.at n=5A207878
• Number T(n,k) of endofunctions f on [n] that are self-inverse on [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=41A245348