649801

Properties

Appears in sequences

• Primes of the form n^2*totient(n)+1 (or A053191(n) + 1).at n=26A076669
• Larger member of twin prime pairs whose sum is a square.at n=26A118593
• p^2 + (p+2)^2 - 1 where (p,p+2) is the n-th twin prime pair.at n=25A184417
• Primes p such that p+1 is the sum of the squares of a pair of twin primes.at n=8A224505
• Primes of the form p^2 + q^2 - 1 where p and q are consecutive primes.at n=31A227340
• Primes p such that (p-1)^2+1 divides 2^(p-1)-1.at n=4A260072
• Numbers n such that (n-1)^2+1 divides 2^(n-1)-1.at n=5A260407
• Numbers m such that 4^(m-1) == 1 (mod (m-1)^2 + 1).at n=13A273870
• Primes p such that (4^(p-1)-1) == 0 mod ((p-1)^2+1).at n=7A273871
• a(n) = 1 - 5*(n + 1)^2 + 5*(n + 1)^4.at n=18A385897
• Prime numbersat n=52816