18911

Properties

Appears in sequences

• Prime quadruples: numbers k such that k, k+2, k+6, k+8 are all prime.at n=17A007530
• Primes that remain prime through 3 iterations of function f(x) = 6x + 1.at n=15A023287
• Primes of the form k^2 + k + 5.at n=37A027755
• Initial terms of '4-block' primes as described in A032591.at n=28A032592
• Increasing gaps among twin primes: the smallest prime of the second twin pair.at n=11A036062
• Primes at which the difference pattern X,2,4,2,Y (X and Y >= 6) occurs in A001223.at n=8A052165
• Primes p such that x^61 = 2 has no solution mod p.at n=37A059230
• a(n) = floor(A^(C^n)), where A = 2.084551112207285611..., C = 1.221.at n=12A060699
• Primes with 14 as smallest positive primitive root.at n=13A061327
• A064434(n) = 0.at n=9A064456
• Least k > n such that p(n) divides p(k), where p(k) denotes the k-th partition number (A000041).at n=30A079031
• Primes which remain prime after one and after two applications of the rotate-and-add operation of A086002.at n=12A086003
• Primes which remain prime after one and after two and after three applications of the rotate-and-add operation of A086002.at n=2A086004
• Primes of the form 5k^2 + 5k + 1.at n=31A090562
• Lesser of a twin-prime pair where both are expressible as the sum of two triangular numbers.at n=34A118638
• a(n) = 15*n*(n+1) + 11.at n=35A132208
• a(n) = a(n-1) + 9*a(n-2) for n >= 2, a(0)=1, a(1)=2.at n=8A133558
• Primes congruent to 31 mod 59.at n=35A142758
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0100 pattern in any orientation.at n=10A146406
• Emirps which remain primes when rotated by 180 degrees on a digital clock display.at n=16A159064