41953

Properties

Appears in sequences

• a(n) = floor(n(n-1)(n-2)(n-3)/18).at n=31A011928
• Primes that remain prime through 3 iterations of function f(x) = 3x + 4.at n=21A023278
• Primes that remain prime through 3 iterations of function f(x) = 8x + 9.at n=15A023295
• Revert transform of 2*x*(1 - x - x^5)-x/(1+x).at n=9A049176
• a(n) and a(n)+4^k are primes at least for k=1,2,3,4.at n=18A049494
• Irregular primes the indices of whose indices are irregular primes of order two.at n=4A090887
• Graham-Pollak sequence with initial term 5.at n=26A091522
• Triangular array: T(n,k) = T(n,n) = 1, T(n,k) = 5*T(n-1, k-1) + 2*T(n-1, k), read by rows.at n=32A119727
• Primes of the form 20*k^2 + 32*k + 13.at n=20A154414
• Numbers that can be written as a^2 + 3*b^2 for some a, b in A155716 and also as c^2 + 6*d^2 for some c, d in A092572.at n=31A380295
• Prime numbersat n=4386