41761

Properties

Appears in sequences

• Half-quartan primes: primes of the form p = (x^4 + y^4)/2.at n=15A002646
• a(1)=a(2)=1, a(n+1) = (a(n)^4 +1)/a(n-1).at n=4A003819
• Numerator of sum of -4th powers of divisors of n.at n=33A017671
• Primes with 19 as smallest positive primitive root.at n=33A061331
• The terms of A073213 (sums of two powers of 17) divided by 2.at n=10A073221
• Largest prime dividing sigma(4,n).at n=15A078553
• Largest prime dividing sigma(4,n).at n=32A078553
• Primes of the form (k^4 + 1)/2.at n=5A096170
• Largest prime factor of n^4 + 1.at n=16A096172
• Primes of the form 8*n^2 + 4*n + 1.at n=23A102130
• Numbers k such that phi(k) + k is a fourth power.at n=21A114072
• Twin prime pairs p, p+2 such that p+(p+2)+1 and p*(p+2)+1 are both square.at n=29A166564
• a(n) = ceiling((n+1)^4/2).at n=16A171714
• a(n) = ((2*n+1)^4+1)/2.at n=8A175110
• Primes of the form 2*n^2 + 70*n + 33.at n=9A217499
• Primes p such that sigma(2p-1) is a prime q.at n=8A247789
• Numbers k such that sigma(2*k-1) is a prime p.at n=15A247820
• Primitive prime factors of the cyclotomic polynomial sequence Phi(8,k) in the order in which they occur.at n=18A256145
• Primes of form n^2 + 20736.at n=12A256840
• Square array read by descending antidiagonals: T(n,k) = ((2^(n+1) + 1)^(k-1) + 1)/2.at n=23A266577