73547

Properties

Appears in sequences

• Number of ways writing 2^n as a sum of a prime and a nonprime.at n=20A062305
• a(n) = ceiling(Sum_{i=1..n-1} a(i)/4) for n >= 2 starting with a(1) = 1.at n=53A120160
• Primes p such that continued fraction of (1 + sqrt(p))/2 has period 14: primes in A146337.at n=25A146359
• Coefficient of x in the reduction of the polynomial x^(2*n) + x^n + 1 by x^3 -> x + 1.at n=22A192813
• a(n) = 3^(-1-floor(n/3))*A215829(n).at n=10A215831
• Prime numbersat n=7261