33427

Properties

Appears in sequences

• Discriminants of imaginary quadratic fields with class number 17 (negated).at n=42A046014
• Number of 3-almostprimes <= 2^n.at n=16A127396
• Primes p such that q*p +- (p mod q) are primes, for q=8.at n=39A178416
• Primes p such that p,q,r,s are consecutive primes and 2p+9, 2q+9, 2r+9, 2s+9 are also primes.at n=8A190354
• G.f.: Sum_{n>=0} n! * x^(n*(n+1)/2) / Product_{k=1..n} (1 - k*x^k).at n=21A204858
• Primes p such that p + 4, p + 16, p + 64, p + 256 and p + 1024 are all semiprimes.at n=26A241493
• a(n) = G_n(5), where G_n(k) is the Goodstein function defined in A266201.at n=20A266204
• Primes that can be generated by the concatenation in base 3, in descending order, of two consecutive integers read in base 10.at n=37A287301
• Prime numbersat n=3580