22391

Properties

Appears in sequences

• Record-setting values of q(n), the minimal prime q such that n(q+1)-1 is a prime p (i.e., q(n) > q(j) for all 0 < j < n).at n=8A062256
• n^2-79*n+1601 as n runs through the lucky numbers.at n=36A087867
• Lesser prime in pair prime(k) +/- k for some k.at n=33A107636
• a(n) = 4*n^3 - 3*n^2 + 2*n - 1.at n=17A131464
• Larger of two consecutive prime numbers such that p0+p1=average of twin prime pairs and p0*p1+7=average of twin prime pairs.at n=5A153375
• Primes whose reversal - 1 is a square.at n=34A167218
• The number of 2 X 2 symmetric positive definite matrices whose entries are integers x,y,z satisfying x^2 + y^2 + z^2 <= n^2.at n=35A219744
• Primes of the form p=3*q+3*r+q*r where q and r are distinct primes and 2*p-3*q, 2*p-3*r and 2*p-q*r are also prime.at n=42A328822
• Prime numbersat n=2506