36855

Appears in sequences

• a(n) = 3*binomial(4*n+8, n)/(n+3).at n=5A006634
• a(n)=a(n-1)+a(n-2)-d, where d=a(n/3) if 3 divides n, else d=0; 2 initial terms.at n=24A050193
• Lucky numbers that are the product of the first m lucky numbers for some m.at n=4A057616
• a(n) = Product_{i=3..n} (prime(i) - 4).at n=7A059863
• Expansion of e.g.f.: exp((-1)^k/k*LambertW(-x)^k)/(k-1)!, k=3.at n=4A060917
• Schroeder pseudoprimes: Composites k that divide the k-th Schroeder number A001003(k-1).at n=28A075764
• Fifth column of (1,5)-Pascal triangle A096940.at n=25A096942
• The number of n-almost primes less than or equal to e^n, starting with a(0)=1.at n=29A116432
• a(n) = n*(n+1)*(4*n+1)/2.at n=26A135713
• Indices k such that A020507(k)=Phi[k](-8) is prime, where Phi is a cyclotomic polynomial.at n=39A138922
• a(1)=1, a(n)=a(n-1)+n^2 if n odd, a(n)=a(n-1)+ n^4 if n is even.at n=12A140150
• The n-th lucky number which is the product of exactly n primes (with multiplicity).at n=6A140286
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.at n=11A148231
• Gromov-Witten invariants for genus 2.at n=4A171110
• Least term of A004767 with exactly 2n divisors.at n=19A204086
• Numbers k with the property that if the base-8 representation of k is read backwards, the result is an integral multiple of k.at n=13A223090
• Number of (2+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=35A250757
• Product of the first n lucky numbers.at n=5A256625
• Least positive integer k with exactly n odd divisors greater than sqrt(2*k).at n=19A281008
• Odd bi-unitary abundant numbers: odd numbers k such that bsigma(k) > 2*k, where bsigma is the sum of the bi-unitary divisors function (A188999).at n=31A293186