19224

Appears in sequences

• a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 4.at n=37A025010
• Number of perifusenes with one internal vertex.at n=11A038383
• Numbers with at least two 3s in their prime signature.at n=47A109399
• E.g.f. exp(2x)*(Bessel_I(0,2*sqrt(2)x) + Bessel_I(1,2*sqrt(2)x)/sqrt(2)).at n=7A119976
• Triangle read by rows: number of hex trees with n edges and k branches of length 1 (0<=k<=n).at n=48A126321
• Numbers of the form p^3*q^3*r where p, q, and r are prime.at n=31A179688
• a(n) is 2^n times the expected value of the shortest run of 0's in a binary word of length n.at n=14A209232
• a(n) = Sum_{i=0..n} digsum_8(i)^3, where digsum_8(i) = A053829(i).at n=51A231682
• a(n) = Sum_{k=0..3} f(n+k)^2 where f=A130519.at n=23A238604
• a(n) = [x^n] 1/(1 + n*x/(1 + n*x^2/(1 + n*x^3/(1 + n*x^4/(1 + n*x^5/(1 - ...)))))), a continued fraction.at n=6A291335