22349

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of the function f(x) = 2*x + 1.at n=18A023272
• Primes of the form p^2 + p - 1 when p is prime.at n=15A053185
• Primes starting a Cunningham chain of the first kind of length 4.at n=13A059763
• Numbers n such that n, 2n+1, 3n+2, 4n+3 are primes.at n=10A067257
• Number of different Euler multigraphs with n edges, loops forbidden.at n=13A068592
• Primes p = p_(n+1) such that p_n + p_(n+2) = 2*p_(n+1) + 12.at n=20A095673
• (prime(n)*(prime(n+1)-1) + (prime(n)-1)*prime(n+1)) / 2.at n=33A099909
• Primes of the form (p*(q-1) + (p-1)*q)/2, where p and q are consecutive odd primes.at n=8A099911
• The 10^n-th irregular prime.at n=3A105463
• Smallest primes starting a complete three iterations Cunningham chain of the first or second kind.at n=19A110025
• Number of obtuse triangles, distinct up to congruence, on a centered hexagonal grid of size n.at n=13A241234
• Primes dividing nonzero terms in A003095: the iterates of x^2 + 1 starting at 0.at n=46A247981
• Least prime q such that p(q*n) is prime, where p(.) is the partition function given by A000041.at n=38A257662
• Primes of the form n^2 + phi(n).at n=24A264771
• G.f.: Product_{i>=1, j>=1, k>=1} (1 + x^(i*j*k)).at n=19A280473
• Primes of at least one of the forms p^2 +- p +- 1, where p is prime.at n=47A290817
• Number of conjugacy classes for a non-abelian group of order p^3, where p is prime: a(n) = p^2 + p - 1 where p = prime(n).at n=34A319597
• Primes p such that q=p^2+p+1 is prime and (q^2+q+1)/3 is prime.at n=29A322748
• a(1) = 1; for n > 1, a(n) is the smallest prime divisor of the number formed by the concatenation of a(1) to a(n-1) that has not previously appeared in the sequence.at n=26A330291
• Primes of the form p+q*(r+s), where p,q,r,s are consecutive primes.at n=9A343449