33721

Properties

Appears in sequences

• a(n) = s(n+3)/5, where s is A024729.at n=14A024730
• Primes of the form 2*k*prime(k) + 1.at n=20A062403
• A Collatz-Fibonacci mixture: a(1) = 1, a(2) = 2, a(n+2) = a(n+1)/2+a(n)/2 if a(n+1) and a(n) have the same parity, a(n+2) = a(n+1)+a(n) otherwise.at n=42A069202
• a(n) = a(n-1) + 2*a(n-2) - 2*a(n-3) + a(n-5).at n=22A116157
• Primes of the form 2*n^2 + 54*n + 25.at n=11A217497
• Primes whose base-7 representation also is the base-3 representation of a prime.at n=30A235470
• Numbers k such that (17*10^k + 67)/3 is prime.at n=22A286395
• Prime numbersat n=3611