121081

Properties

Appears in sequences

• Pisot sequence E(6,16), a(n) = floor( a(n-1)^2/a(n-2) + 1/2 ).at n=10A010915
• a(n) = prevprime(A090117(n)), the largest prime previous to squares given in A090117, being such that distance of a(n) to the following prime equals 2*n.at n=20A090118
• Number of ways to write n as an ordered sum of 1's, 2's and 3's such that no 2 precedes any 1.at n=29A124062
• Primes p such that q-p = 42, where q is the next prime after p.at n=27A134120
• Primes of the form p^2 + q^2 - 1 where p and q are consecutive primes.at n=17A227340
• Value of prime number D for incrementally largest values of minimal x satisfying the equation x^2 - D*y^2 = 5.at n=36A341079
• Value of prime number D for incrementally largest values of minimal y satisfying the equation x^2-D*y^2=5.at n=33A341081
• E.g.f. A(x) satisfies A(x) = exp( x/(1-x)^3 * A(x)^2 ).at n=5A390300
• Prime numbersat n=11399