26921

Properties

Appears in sequences

• Where prime race 4m-1 vs. 4m+1 is tied.at n=10A007351
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 65.at n=1A031653
• Primes p from A031924 such that A052180(primepi(p)) = 13.at n=35A052233
• Primes of the form 16*m^2 + 25, m=1,3,5,...at n=10A087856
• Primes of the form 16*m^2 + 25 for m=1,2,3,...at n=18A087857
• Poincaré series [or Poincare series] (or Molien series) for a certain four-fold wreath product P_4.at n=53A091434
• Primes p such that the number of primes less than p equal to 1 mod 4 is one less than the number of primes less than p equal to 3 mod 4.at n=23A096448
• Primes p equal to the sum of two successive sexy primes + 1 such that p + 6 is also prime.at n=38A104043
• Fixed points for prime number permutation A108546.at n=18A108547
• Larger of two consecutive primes whose sum is a square.at n=17A118591
• 3n^3 - 2n^2 + n - 1.at n=20A130885
• Primes p such that the multiplicative order of 2 modulo p is (p-1)/10.at n=36A152310
• Primes of the form sum_{j=1..n} (-1)^j *prime(j)*prime(j+1).at n=4A197422
• Primes of the form 8n^2 + 9.at n=23A201705
• Smallest number k > 0 such that sigma(x) and sigma(x)+2 are both prime, where x = (6k+1)^(6n+4), or -1 if no such k exists.at n=7A275237
• Expansion of Sum_{i>=2} prime(i)*x^prime(i)/(1 - x^prime(i)) / Product_{j>=1} (1 - x^j).at n=26A281905
• Primes prime(k) such that 2*(prime(k)^2 - prime(k-1)^2) is a perfect square.at n=19A335410
• Primes of the form k^2 + 25.at n=38A346145
• Prime numbersat n=2953