54293

Properties

Appears in sequences

• Primes of form k^2 + 4.at n=38A005473
• Primes of the form p^2 + 4, where p is prime.at n=15A045637
• Primes of the form F(i)^2 + F(j)^2, where F() are Fibonacci numbers.at n=13A045703
• Numerators of increasingly better rational approximations to Pi with increasing denominators (3/1, 13/4, 16/5, 19/6, 22/7, 179/57, ...)at n=20A063674
• Primes of the form n^2 + 4n + 8.at n=37A098062
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.at n=13A146034
• Prime p of the form a^b + c^d = p, where a, b, c, d are also primes.at n=35A164074
• Prime p1 of the form a^b + c^d = p1, where a, b, c, d are primes and a + b + c + d = p2, where p2 (A164076) is also prime.at n=19A164075
• List of primes of the form x^2+y^2 such that tau(x^2+y^2) = bigomega(x*y).at n=25A174024
• Values of q in A176983.at n=15A177831
• Primes p such that 2p+1, 3p+2 and 5p-2 are also primes.at n=39A178068
• Number of nX4 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=7A300642
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=58A300646
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=62A300646
• Primes of the form H(m,k) = F(k+1)*F(m-k+2) - F(k)*F(m-k+1), where F(m) is the m-th Fibonacci number and m >= 0, 0 <= k <= m.at n=42A360932
• Prime numbersat n=5523