25847

Properties

Appears in sequences

• Primes whose consecutive digits differ by 3 or 4.at n=38A048415
• a(n) = A075443(A075451(n)).at n=33A075452
• Least k such that the class number of quadratic order of discriminant D=-4k equals p, where p runs through the primes.at n=36A079029
• Let p(k) = k-th prime; sequence gives primes q of the form q = k*p(k) - 1 for some k.at n=8A096065
• Indices of primes in the sequence defined by A(0) = 47, A(n) = 10*A(n-1) - 33 for n > 0.at n=28A101724
• The lesser of twin primes p such that p*q+a+b+c are also the lesser of twin primes, (p and q are twin primes, p+2=q, a=p-1,b=(p+q)/2,c=q+1).at n=21A168536
• Lesser of twin primes p such that 6*p+1 is greater of twin primes.at n=14A176131
• Primes of the form 15*k^2 - 15*k + 17.at n=30A220081
• Number of (n+1) X (2+1) 0..3 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=4A251049
• Number of (n+1)X(5+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=1A251052
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=16A251055
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=19A251055
• Primes p such that prime(p)^2 - 2 = prime(q) for some prime q.at n=24A261354
• Primes p such that phi(p-3) = phi(phi(p-2)-1).at n=19A271658
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 446", based on the 5-celled von Neumann neighborhood.at n=37A272250
• Primes p such that p+2, 3*p+2 and 3*p+8 are also primes.at n=17A278138
• Numbers which are palindromic in their Elias delta code representation.at n=46A281380
• a(n) is the least prime p such that the orderly concatenation of the n successive powers of p yields a prime number; a(n)=0 if n is a multiple of 6.at n=43A292163
• Primes p such that 4*p+3, 6*p+5 and 8*p+7 are all primes.at n=33A329551
• Primes p such that p+2 is prime and p+A001414(p+1)+(p+2) is prime.at n=46A330488