26641

Properties

Appears in sequences

• Number of points in interior of n-th crystal ball in E_8 lattice.at n=2A001361
• Primes of the form 666*n + 1.at n=14A037029
• Sizes of successive balls in E_8 lattice.at n=4A046948
• Numbers k such that 285*2^k + 1 is prime.at n=27A053359
• Balanced primes of order four.at n=32A082079
• Triangle of primes associated with A083773.at n=26A083775
• Prime numbers p such that p +- ((p-1)/3) are primes.at n=24A137703
• Numbers k such that 18^k - 17^k is prime, or a strong pseudoprime.at n=4A188051
• Centered 40-gonal numbers.at n=36A195317
• Primes of the form 5*k^2 - 4.at n=19A201786
• a(n) = 1+2*(d1 + 1)*(d2 + 1)*...*(dk + 1), where d1, d2, ..., dk are the prime factors of the n-th Fermat pseudoprime to base 2 A001567(n).at n=23A216646
• Primes p for which there are exactly as many primes in the range [p^2, p*nextprime(p)] as there are in the range [p*nextprime(p), nextprime(p)^2], where nextprime(p) gives the next prime after prime p.at n=32A256472
• Primes of form n^2 + 10000.at n=23A256838
• Primes p such that p = q^2 + 8*r^2 where q and r are also primes.at n=27A260556
• Primes p such that 2*p + 79 is a square.at n=9A269790
• Primes p such that both 2p-1 and 2p^2-2p+1 are prime.at n=32A274609
• Primes p such that A001175(p) = (p-1)/8.at n=8A308793
• Prime numbers congruent to 1 or 169 modulo 240 representable by both x^2 + 150*y^2 and x^2 + 960*y^2.at n=36A325087
• Prime numbersat n=2921