23311

Properties

Appears in sequences

• a(n) = largest noncomposite factor of 2^(2n+1) - 1.at n=22A002588
• Divisors of 2^45 - 1.at n=15A003550
• Fibonacci sequence beginning 1, 23.at n=16A022393
• Primes that are palindromic in base 5.at n=30A029973
• Primes of the form 666*n + 1.at n=11A037029
• Base 5 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,2.at n=6A037546
• Primes corresponding to A046411.at n=38A038514
• Least prime in A031928 (lesser of 10-twins) whose distance to the next 10-twin is 6*n.at n=36A052354
• Numbers k such that 5*2^k + 7 is prime.at n=28A059748
• Sum of the n-th row of A077339.at n=20A081929
• Primes n*A092961(n) + 1.at n=34A092963
• Primes that are a concatenation of 2, 3 and a prime.at n=15A101218
• Primes by index in A001945.at n=54A104499
• Primes from merging of 5 successive digits in decimal expansion of cos(1).at n=22A104961
• Home primes whose homeliness is 4.at n=27A133962
• Prime numbers p such that p +- ((p-1)/3) are primes.at n=21A137703
• Primes p such that (p-1)*p*(p+1)-p+2 and (p-1)*p*(p+1)+p-2 are primes.at n=34A154944
• a(n) = 1 + n*(n+1)*(n-1)/2.at n=36A158842
• Numbers k such that k^p-p is prime, where p is product of the digits of k.at n=20A178328
• Primes with eight embedded primes.at n=15A179916