20399

Properties

Appears in sequences

• Prime number spiral (clockwise, Southeast spoke).at n=24A054564
• Luhn primes: primes p such that p + (p reversed) is also a prime.at n=38A061783
• a(1)=2; a(n) for n>1 is the smallest prime number > a(n-1) such that the concatenation of all previous terms is also prime.at n=32A080155
• Beginning with 3, least prime, greater than the previous term, such that the arithmetic mean of first n terms is a prime.at n=44A090918
• Primes p that divide Fibonacci[(p-1)/7].at n=28A125253
• Primes congruent to 44 mod 59.at n=38A142771
• Primes of the form : (p-n)/(n+1)=prime and (n+1)*p+n=prime. n=4.at n=28A152294
• Primes p such that (p-7)/8 and 8p + 7 are both prime.at n=22A158238
• Primes p dividing every A167859(m) from m=(p-1)/2 to m=(p-1).at n=26A167860
• Primes of the form n + sum of proper non-divisors of n.at n=23A192560
• Primes of the form 2n^2 - 3.at n=26A201712
• Least prime k such that k*2^n + 1 divides 2^k - 1, or 0 if no such prime exists.at n=13A219341
• Consider two consecutive primes {p,q} such that P=2p+q and Q=2q+p are both prime. The sequence gives primes Q.at n=41A248483
• Primes such that A271229(n) = prime(n).at n=27A276649
• Prime p1 of consecutive primes p1, p2, where p2 - p1 = 8, and p1, p2 are in different centuries.at n=15A287049
• Primes that can be generated by the concatenation in base 6, in ascending order, of two consecutive integers read in base 10.at n=11A287306
• Primes of the form (p + prime(p))/2 with prime p.at n=47A306627
• Primes p such that A001175(p) = (p-1)/7.at n=16A308792
• Primes p such that A001177(p) = (p-1)/7.at n=9A308800
• a(n) = A120963(n)/2.at n=20A341710