22091

Properties

Appears in sequences

• Prime number spiral (clockwise, East spoke).at n=25A054555
• Primes p that have exactly three primitive roots that are not primitive roots mod p^2.at n=7A060519
• Prime(n) and prime(n+2) use the same digits.at n=29A069794
• Near twin primes of order 18: twin primes (p, p+2) such that p+18 and p+20 are primes.at n=31A079304
• Minimal set of prime-strings in base 10 for primes of the form 4n+3 in the sense of A071062.at n=29A111056
• One seventh of the sum of the first n primes, when an integer.at n=34A112272
• Primes in toothpick sequence A153006.at n=27A153009
• a(1) = 3. For n > 1, Ulam's spiral is started with a(n-1), and the primes p on the NE spoke are considered. a(n) is the minimal p that is the lesser of a twin prime pair.at n=27A163586
• Primes such that applying "reverse and add" twice produces two more primes.at n=4A174402
• Primes p of the form 4*k+3 such that p+2 is prime and p-1 is nonsquarefree.at n=23A175606
• Positive integers of the form (30*m^2+1)/11.at n=16A179339
• Primes of the form 10n^2 + 1.at n=16A201709
• Primes p with q = p + 2 and prime(q) + 2 both prime.at n=37A236457
• Primes p with p + 2, prime(p) + 2 and prime(prime(p)) + 2 all prime.at n=5A236481
• Let F(g,p) be the frequency of g up to prime nextprime(p+1). Primes p such that F(2,p) = F(4,p) and g = 2 or 4.at n=45A274122
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 433", based on the 5-celled von Neumann neighborhood.at n=14A282201
• Lesser of twin primes p, p+2 such that prime(p) and prime(p+2) are also twin primes.at n=17A332968
• First of three consecutive primes p,q,r such that r*(p+q) + p*q and r*(p+q) - p*q are prime.at n=36A358382
• Number of integer partitions of n such that (length) * (maximum) >= 2*n.at n=37A361906
• a(n) is the number of multisets with n primes with which an n-gon with perimeter prime(n) can be formed.at n=36A376348