39241

Properties

Appears in sequences

• a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 2 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 3.at n=34A050051
• Take A000040, omit commas: 23571113171923..., select 5-digit primes seen when scanning from left.at n=24A073038
• a(n) is the n-th prime whose decimal expansion begins with the decimal expansion of n.at n=38A077345
• Primes of the form (k+1)*prime(k) + k*prime(k+1).at n=24A097241
• Prime numbers p such that p +- ((p-1)/3) are primes.at n=37A137703
• Primes which become squares when the digits are rotated once to the right.at n=21A234925
• Primes of form n^2 + 10000.at n=33A256838
• Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1, k + 2 and k + 3.at n=20A318527
• Prime numbersat n=4134