22271

Properties

Appears in sequences

• Prime quadruples: numbers k such that k, k+2, k+6, k+8 are all prime.at n=20A007530
• Initial members p of prime 5-tuples (p, p+2, p+6, p+8, p+12).at n=7A022006
• Initial terms of '4-block' primes as described in A032591.at n=33A032592
• Primes at which difference pattern X2424Y (X and Y >= 6) occurs in A001223.at n=2A052167
• Least k such that the class number of quadratic order of discriminant D=-4k equals p, where p runs through the primes.at n=42A079029
• Primes p such that three (the maximum number) primes occur between p and p+12.at n=15A086140
• a(n) = lesser of a pair of twin primes p, q=p+2 such that product of first n primes plus p is a prime and also product of first n primes plus q is a prime.at n=41A090795
• Numbers n + product of digits associated with A091628.at n=3A091630
• k-th lower twin prime, where k is the n-th Fibonacci number.at n=13A093306
• Primes of the form 4*k-1 such that 8*k-1 and 16*k-1 are also primes.at n=34A101791
• Primes p such that 2p+1, 4p+3, 6p+5 are all primes.at n=22A107020
• Lesser prime in pair prime(k) +/- k for some k.at n=32A107636
• Primes arising in A093483.at n=21A127903
• Select all integers from the list (p(k)-k)/tau(k), k>=1; p = A000041, tau = A000005.at n=17A141669
• Initial members of prime triples (p, p+2, p+6) for which also the sum 3p+8 is prime.at n=28A162001
• Prime numbers containing the string 222.at n=5A166580
• Primes p such that (p, p+2, p+6, p+12) is a prime quadruple.at n=34A172454
• Triangle T(n, k) = A172452(n) - A172452(k) - A172452(n-k), read by rows.at n=57A172970
• Triangle T(n, k) = A172452(n) - A172452(k) - A172452(n-k), read by rows.at n=63A172970
• Primes p such that the polynomial x^2 + x + p generates only primes for x = 0, ..., 4.at n=17A187057