23081

Properties

Appears in sequences

• Number of 3's in n-th term of A022470.at n=41A022474
• Least prime in A031924 (lesser of 6-twins) such that the distance to the next 6-twin is 2*n.at n=40A052352
• Numbers n such that ((1+I)^n+1)/(2+I) is a Gaussian prime.at n=25A124112
• Primes p such that (2^p + 2^((p+1)/2) + 1)/5 is prime.at n=8A124165
• Primes of the Form : p1=a*b+c;p2=a*c+b;p3=b*c+a;p=(p1+p2+p3)/2; p1,p2 and p3 are three consecutive prime numbers.at n=5A157722
• Primes p such that 4*p and 6*p are each the sum of two consecutive primes.at n=35A164133
• Primes such that applying "reverse and add" twice produces two more primes.at n=6A174402
• a(n) = Sum_{k=1..n} k*k', where n' is the arithmetic derivative of n.at n=44A190117
• Second prime p such that (p+n)^2+n is prime but (p+j)^2+j is not prime for all 0<j<n.at n=38A238674
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 157", based on the 5-celled von Neumann neighborhood.at n=31A270331
• Expansion of Product_{k>=1} (1 + x^k) * (1 + x^(2*k)) * (1 + x^(3*k)).at n=37A327045
• Beginning with 11, least prime such that concatenation of first n terms and its digit reversal both are primes.at n=28A380227
• Prime numbersat n=2578