1378277

Properties

Appears in sequences

• a(n) = 1 + a(floor(n/2))*a(ceiling(n/2)) for n > 1, a(1) = 4.at n=9A005511
• Primes of form 4*p^2 + 1, p prime.at n=17A052292
• Primes of form n^2 + mu(n), where mu is A008683.at n=25A062459
• Primes of the form 81n^2 - 90n + 26.at n=14A144571
• Primes of the form n^2+1 such that (n+2)^2+1 is also prime.at n=14A206328
• First of two consecutive (primes of the form n^2+1) with no semiprime of the same form between them.at n=18A242109
• Divisorial primes: primes p of the form p = 1 + Product_{d|k} d for some k.at n=19A258455
• Divisorial primes p of the form p = 1 + k^2 where k^2 = Product_{d|k} d= A007955(k) for some k.at n=17A258896
• Least prime p of the form k^2+1 such that p == A002496(n) (mod A002496(n+1)) with p>A002496(n), or 0 if no such p exists.at n=7A348598
• Prime numbersat n=105563