21407

Properties

Appears in sequences

• Third term of weak prime sextet: p(m-1)-p(m-2) < p(m)-p(m-1) < p(m+1)-p(m) < p(m+2)-p(m+1) < p(m+3)-p(m+2).at n=6A054830
• Smallest balanced prime of order n.at n=43A082080
• Primes congruent to 49 mod 59.at n=35A142776
• Prime numbers where the last digit is the sum of all the previous digits.at n=33A156617
• Primes of the form 7*x^2 - 5*y^2, where x and y are successive natural numbers.at n=37A176557
• Primes that are the average of the members of emirp pairs.at n=10A178581
• Nonpalindromic primes that are the average of the members of emirp pairs.at n=2A178585
• Primes p such that p-1 is squarefree and all prime divisors of p-1 other than 11 are also in the sequence.at n=29A267504
• E.g.f.: exp(1 + x^2/2 - exp(x)).at n=12A337062
• Primes in A239237.at n=15A361252
• First of three consecutive primes whose concatenations, both forward and backward, are primes.at n=41A384953
• Prime numbersat n=2404