353641

Properties

Appears in sequences

• a(1)=9, a(n_even)=(a(n-1)^2-1)/2; a(n_odd)=a(n-1)+1.at n=6A076603
• Largest prime dividing sigma(4,n).at n=27A078553
• Primes of the form (k^4 + 1)/2.at n=8A096170
• Largest prime factor of n^4 + 1.at n=28A096172
• Primes of the form prime(x)^2 + (prime(x) - 1)^2.at n=19A147718
• Primes of the form 50n^2 + 10n + 1.at n=33A154428
• a(n) = ceiling((n+1)^4/2).at n=28A171714
• a(n) = ((2*n+1)^4+1)/2.at n=14A175110
• Primes p such that sigma(2p-1) is a prime q.at n=10A247789
• Numbers k such that sigma(2*k-1) is a prime p.at n=27A247820
• Primitive prime factors of the cyclotomic polynomial sequence Phi(8,k) in the order in which they occur.at n=31A256145
• Number of partitions of n^4 into at most two parts.at n=29A274323
• Primes of the form (p^4 + 1)/2, where p is prime.at n=7A277201
• Primes of the form (p^k+1)/2 where p is prime and k > 1.at n=36A308442
• Prime numbersat n=30262