21863

Properties

Appears in sequences

• Denominators of continued fraction convergents to sqrt(913).at n=11A042765
• Second term of weak prime sextet: p(m)-p(m-1) < p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2) < p(m+4)-p(m+3).at n=8A054829
• Primes p such that 2*p^5-+3 are also prime.at n=5A174368
• Primes p such that 12*p^2-1 and 16*p^3-1 are also primes.at n=33A193051
• Lesser of consecutive primes whose sum is a palindromic number.at n=28A242386
• A set of nine consecutive primes forming a 3 X 3 semimagic square with the smallest magic constant (65573).at n=5A265614
• Smallest known example of a 3 X 3 X 3 generalized arithmetic progression (GAP) of 27 primes, listed in increasing order.at n=22A290967
• Numbers k such that (14*10^k + 229)/9 is prime.at n=16A294940
• Number of multiset partitions of uniform multisets of size n whose union is an initial interval of positive integers.at n=9A322784
• 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=40A328822
• Primes p such that (p^256 + 1)/2 is prime.at n=18A341234
• Primes p, not safe primes, such that the smallest factor of (2^(p-1)-1) / 3 is equal to p.at n=27A360827
• Prime numbersat n=2453