401957

Properties

Appears in sequences

• Primes of form 4*p^2 + 1, p prime.at n=14A052292
• Primes of form n^2 + mu(n), where mu is A008683.at n=17A062459
• Primes p such that sigma(p-1)+sigma(p+1) is prime.at n=15A067464
• Primes p such that all prime factors of p-1 have exponent 2.at n=26A089195
• Primes of the form 81n^2 - 90n + 26.at n=10A144571
• Lower twin primes p1 such that p1-1 is a square.at n=20A145824
• Primes of the form n^2+1 such that (n+2)^2+1 is also prime.at n=9A206328
• First of two consecutive (primes of the form n^2+1) with no semiprime of the same form between them.at n=12A242109
• Divisorial primes: primes p of the form p = 1 + Product_{d|k} d for some k.at n=16A258455
• Divisorial primes p of the form p = 1 + k^2 where k^2 = Product_{d|k} d= A007955(k) for some k.at n=14A258896
• Prime numbersat n=33997