73500

Appears in sequences

• Expansion of 1/Product_{m>=1} (1 - m*q^m)^30.at n=4A022754
• McKay-Thompson series of class 10a for Monster.at n=13A058102
• Numbers k such that previous_prime(k)=k-sd and next_prime(k)=k+sd where sd is sum of the distinct prime factors of k.at n=8A125841
• Triangle read by rows: number of nilpotent partial transformations (of an n-element set) of height r (height(alpha) = |Im(alpha)|), 0 <= r < n.at n=24A141618
• G.f.: A(q) = exp( Sum_{n>=1} A002129(n) * 3*A038500(n) * q^n/n ).at n=26A161804
• A trisection of A161804: a(n) = A161804(3n+2) for n>=0.at n=8A161807
• Numbers with prime factorization p*q^2*r^2*s^3 (where p, q, r, s are distinct primes).at n=34A190109
• Numbers whose square is both a sum and a difference of two positive cubes.at n=19A230716
• Numbers n = concat(x,y) such that the product x*y | n. No leading zeros in y allowed.at n=42A255726
• Numbers k such that k and usigma(k) have the same set of prime divisors, where usigma(k) is the sum of unitary divisors of k (A034448).at n=28A329858
• Numbers whose prime exponents generates rotationally symmetric XOR-triangles.at n=35A335019
• Triangle read by rows: T(n, k) is the denominator of the probability of winning a certain game while playing optimally.at n=39A370399
• E.g.f. A(x) satisfies A(x) = 1 - (1/x) * log(1 - x^2*A(x)).at n=7A392929