22171

Properties

Appears in sequences

• Cycle-path coverings of a family of digraphs.at n=10A030236
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 100 ones.at n=12A031868
• Concatenation of prime p and nextprime(p) is prime -> cycles of 2 steps possible.at n=5A036339
• Least prime in A031936 (lesser of 18-twins) whose distance to the next 18-twin is 2*n.at n=20A052358
• E.g.f.: exp( x/( 1 - x - x^2 - x^3 ) ).at n=6A080835
• Primes p = prime(i) of level (1,3), i.e., such that A118534(i) = prime(i-3).at n=38A118467
• Primes in A168472.at n=17A168473
• Primes of the form 2*n^2+66*n+31.at n=13A243957
• Number of hypermaps which are self-equivalent with respect to reversing the colors of the nodes and which have n edges.at n=10A289678
• Primes which, when added to their reversals, produce palindromic primes.at n=22A342681
• Prime numbersat n=2487