122131

Properties

Appears in sequences

• Primes that are decimal concatenations of n with n + 9.at n=20A032632
• Least prime in A031934 (lesser of 16-twins) whose distance to the next 16-twin is 6*n.at n=33A052357
• a(n) is the n-th prime that ends with prime(n), or 0 if there do not exist n primes ending with prime(n).at n=31A089778
• Primes with digital product = 12.at n=29A107697
• Say what you see in previous term, reporting each digit encountered followed by frequency.at n=5A121808
• Primes whose digits add to 10 and which have a 3 in the tens place.at n=28A227825
• Primes p such that p^2 - p - 1, p^3 - p - 1 and p^4 - p - 1 are all prime.at n=11A236173
• Primes p whose binary representation p_2 is the decimal representation of a prime q; and also the sum of the decimal digits of p equals the sum of the digits of p_2.at n=12A281299
• a(n) is the least prime p such that (p^2-2*n)/(2*n-1) and (p^2+2*n)/(2*n+1) are both prime, or 0 if such p does not exist.at n=28A344463
• Expansion of (1/x) * Series_Reversion( x/(1-x+x^3) ).at n=21A366051
• Prime numbersat n=11489