221717

Properties

Appears in sequences

• First term of weak prime septet: p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2) < p(m+4)-p(m+3) < p(m+5)-p(m+4) < p(m+6)-p(m+5).at n=10A054834
• Lesser of twin primes such that both twin primes have no bases b, 1 < b < p-1, in which p is a palindrome.at n=25A138348
• Primes p such that the polynomial x^2 + x + p generates only primes for x = 1..5.at n=19A187058
• Initial primes of 5 consecutive primes with consecutive gaps 2, 4, 6, 8.at n=24A190814
• Initial primes of 6 consecutive primes with consecutive gaps 2,4,6,8,10.at n=6A190817
• Prime numbers p such that x^2 + x + p produces primes for x = 0..5 but not x = 6.at n=10A210364
• Prime numbersat n=19754