28057

Properties

Appears in sequences

• Primes of form (p^x - 1)/(p^y - 1), p prime.at n=21A003424
• Prime numbers that are the sum of the divisors of some n.at n=16A023195
• Primes arising in A048969.at n=36A048977
• Primes arising in A048969.at n=39A048977
• Primes p such that p, p+12, p+24 are consecutive primes.at n=27A052188
• Primes of the form p^2 + p + 1 when p is prime.at n=10A053183
• a(n) = p^2 + p + 1 where p runs through the primes.at n=38A060800
• Terms of A000203 that are prime.at n=17A062700
• Primes of the form 4*k^2 - 10*k + 7 with k positive.at n=29A073337
• Primes that can be written as 1+p+p^k, p prime and k > 1.at n=21A084444
• Primes of the form 1+(1+p)*p^e, p prime and e>0.at n=22A087196
• Primes such that successive differences are increasing palindromes.at n=21A087581
• Record values of A062700.at n=13A100382
• K-bit primes p such that p-2^i and p+2^i are composite for 0<=i<=K-1.at n=19A153352
• 1/25 the number of (n+1) X 3 0..4 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.at n=2A203650
• 1/25 the number of (n+1) X 4 0..4 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.at n=1A203651
• T(n,k)=1/25 the number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.at n=7A203656
• T(n,k)=1/25 the number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.at n=8A203656
• Numbers arising in computing the Turan function of cycles of length 4.at n=42A217004
• Bertrand primes II: a(n) is the largest prime < 2*a(n-1)-2.at n=14A227770