64711

Appears in sequences

• Numbers n such that n = pi(n)*k + 1 for some k.at n=40A065136
• Numbers n such that there exists at least one number j and pi(m) = d_1 d_2 ... d_j*d_(j+1) d_(j+2) ... d_k where d_1 d_2 ...d_k is the decimal expansion of n.at n=36A112012
• Numbers k such that the value pi(k), the number of primes <= k, can be obtained deleting some of the repeating adjacent digits of k.at n=21A113898
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+809)^2 = y^2.at n=8A123654
• Number of length 4 arrays x(i), i=1..4 with x(i) in i..i+n and no value appearing more than 2 times.at n=14A250353
• Numbers n = concat(s,t) such that n = prime(s) + prime(t).at n=9A251860
• Numbers n such that T(n) + T(n+1) + ... + T(n+26) is a square, where T = A000217 (triangular numbers).at n=21A257709