217157

Properties

Appears in sequences

• Primes of form 4*p^2 + 1, p prime.at n=13A052292
• Primes of form n^2 + mu(n), where mu is A008683.at n=15A062459
• Primes p such that sigma(p-1)+sigma(p+1) is prime.at n=14A067464
• Primes p such that all prime factors of p-1 have exponent 2.at n=22A089195
• Number of non-intersecting cycle systems in a particular directed graph.at n=13A114300
• Primes associated with A127435.at n=25A127436
• List of primes of the form x^2+y^2 such that tau(x^2+y^2) = bigomega(x*y).at n=37A174024
• First of two consecutive (primes of the form n^2+1) with no semiprime of the same form between them.at n=10A242109
• Divisorial primes: primes p of the form p = 1 + Product_{d|k} d for some k.at n=14A258455
• Divisorial primes p of the form p = 1 + k^2 where k^2 = Product_{d|k} d= A007955(k) for some k.at n=13A258896
• Primes p such that gcd(phi(p-1), sigma(p-1)) = 1 with phi = A000010, sigma = A000203.at n=39A270539
• Prime numbersat n=19374