18166

Appears in sequences

• Denominators of continued fraction convergents to sqrt(804).at n=9A042551
• Roman numerals for n evaluated as if in Sallows' base 27.at n=24A073427
• a(n) = (A097406(n) - 1)/n.at n=32A097407
• Numbers k for which 16*k+1, 16*k+3, 16*k+7, 16*k+13 and 16*k+15 are primes.at n=2A123990
• a(1)=1; for n>1, a(n) = Sum_{k=1..n-1} a(k) * floor(n/k).at n=13A126656
• Successive maximal values of A174435.at n=24A174437
• Least number k such that k*n+1 is a prime dividing 2^n-1.at n=31A186283
• Numbers k such that k!3 - 3^2 is prime, where k!3 = k!!! is a triple factorial number (A007661).at n=37A243078
• a(n) = (a(n-3) + a(n-1) * a(n-5)) / a(n-6), a(0) = a(1) = ... = a(5) = 1.at n=24A275173
• G.f. satisfies A(x) = 1 + x/(1 - x^4) * A(x/(1 - x^4)).at n=19A360891
• Number of permutations (p(1),p(2),...,p(n)) of (1,2,...,n) such that p(i)-i is in {-2,0,7} for all i=1,...,n.at n=42A387021