31223

Properties

Appears in sequences

• Discriminants of totally complex sextic fields (negated).at n=31A023687
• Number of permutations P of {1,2,...,n} such that P(1)=1 and |P^-1(i+1)-P^-1(i)| equals 1 or 2 for i=1,2,...,n-1.at n=26A038718
• Primes whose decimal representation is a valid number in base 5 and interpreted as such is again a prime.at n=44A090708
• Row 4 of table A162424.at n=30A162427
• Primes p such that q = p^2 + p + 1 is an emirp.at n=38A178545
• a(1) = 3 ; a(n+1) is the prime number obtained by the concatenation {p, a(n)} where p is the smallest prime prefix.at n=3A202997
• Position of 1/n in the ordering of the rationals given by application of the map t -> (1+t,-1/t), cf. A226130.at n=8A226274
• Primes p such that the sum of the cubes of digits of p equals the sum of digits of p^3.at n=13A291052
• Square array read by antidiagonals upwards: T(n,k) for integer k >= 0 is the n-th prime p such that p^(2*3^k) + p^(3^k) + 1 is prime.at n=41A344448
• Successive primes generated in A379355.at n=3A379782
• Prime numbersat n=3364