39839

Properties

Appears in sequences

• Safe primes (A005385) (p and (p-1)/2 are primes) such that 12*p+1 is also prime.at n=67A075707
• Value of C in y = x^2+7x+C such that y is prime for all x = 0 to 4.at n=33A097436
• 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=32A168536
• Primes p such that p^2 + 6, p^2 + 12 and p^2 + 18 are all prime.at n=13A173627
• Emirps whose internal digits are also an emirp.at n=35A225235
• Primes of the form abcabc..abcab.at n=33A228627
• Tenth 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=20A238682
• Positions of records in A263455.at n=17A263926
• Numbers k such that (91*10^k + 17)/9 is prime.at n=21A289050
• Partial sums of A299259.at n=35A299265
• Lesser of twin primes (A001359) being both half-period primes (A097443).at n=41A347225
• Lesser twin primes p such that 4*p is the sum of two consecutive primes.at n=35A350736
• Primes having only {3, 8, 9} as digits.at n=29A385792
• Prime numbersat n=4187