131321

Properties

Appears in sequences

• Home primes whose homeliness is 6.at n=21A133966
• a(n) = n if n is 1 or prime; otherwise (1) let m = (concatenation of the two divisors in the middle of rows of A027750(n)), (2) if m is prime then a(n) = m, otherwise return to (1) with n=m.at n=48A329181
• Primes having square prime gaps to both neighbor primes.at n=32A353088
• Smallest Sophie Germain prime >= 2^n.at n=17A367966
• Prime numbersat n=12271