31799

Properties

Appears in sequences

• Primes p such that 2*p+1 and ((2*p+1)^2 + 1)/2 = p^2 + (p+1)^2 are primes.at n=33A098717
• Primes p such that p's set of distinct digits is {1,3,7,9}.at n=21A108386
• Numbers k such that 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)-1 and 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)+1 are twin primes with p(h) = h-th prime.at n=36A129311
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 1), (1, -1, 0), (1, 0, -1), (1, 0, 0)}.at n=9A148910
• Emirps using each of the digits 1, 3, 7, 9 at least once, but no others.at n=8A158917
• Palindromic primes in base 8 which are also emirps (A006567) in base 10.at n=13A168110
• Emirps whose internal digits are also an emirp.at n=30A225235
• Numbers k such that 11*12^k + 1 is prime.at n=8A251259
• Primes p congruent to 1 modulo 13 such that x^13 = 2 has a solution modulo p.at n=19A275773
• Prime numbersat n=3419