18885

Appears in sequences

• Numbers k such that the Woodall number k*2^k - 1 is prime.at n=20A002234
• Numbers n such that 105*2^n-1 is prime.at n=37A050578
• Number of primitive Pythagorean triangles with perimeter equal to A002110(n), the product of the first n primes.at n=20A077177
• Triangle read by rows: T(n,k) is the number of ordered trees having n edges and k branches of length 2.at n=37A101307
• Numbers n such that Maple 9.5, Maple 10, Maple 11 and Maple 12 give the wrong answers for the number of partitions of n.at n=14A110375
• Numbers divisible by prime(d) for each digit d in their base-6 representation, none of which may be zero.at n=29A256876
• Expansion of e.g.f. 2/(1 + sqrt(1 + 4*LambertW(-x))).at n=5A295267
• Numbers k such that k and k + 1 are both lazy-Lucas-Niven numbers (A351719).at n=39A351720
• Expansion of 1/(1 - x/(1 - x)^3)^2.at n=8A382616
• Numbers k such that (k*2^d - 1)*(d*2^k - 1) is semiprime for some divisor d of k.at n=45A382646