1021020

Appears in sequences

• Coefficients of Legendre polynomials.at n=6A001802
• Increasing values of A000793 (largest order of permutation of n elements).at n=35A002809
• Least common multiple of {b(1),...,b(n)}, where b(k) = k(k+1)(2k+1)/6 = A000330(k).at n=7A051538
• a(n) = LCM { Catalan(0), ..., Catalan(n) }.at n=9A051575
• Maximal order of element of alternating group A_{2n}.at n=31A057742
• Maximal order of element of alternating group A_{2n+1}.at n=31A057743
• Ordered products of the sides of primitive Pythagorean triangles.at n=23A063011
• Integers n for which the ratio phi(n)/pi(n) is smaller than for any subsequent n. Here phi(n) is Euler's totient function and pi(n) is the number of primes that are at most n.at n=32A080289
• n-th roots of the n-th powers pertaining to A082236.at n=13A082237
• Twice the primorials (first definition), 2*A002110(n).at n=6A088860
• Array read by rows: T(n,k) = binomial(n+k-2,k-1)*binomial(2*n-1,n-k).at n=39A091811
• Smallest m such that A097249(m) = n; from n=1 onwards, twice the primorials, 2*A002110(n).at n=7A097250
• Least integer "mod 2 prime signatures" k ordered by number of primitive Pythagorean triples with leg = k.at n=35A097275
• Primorial inflation of n: Fully multiplicative with a(p) = p# for prime p, where x# is the primorial A034386(x).at n=33A108951
• Triangle T(n,k) = lcm(1,...,2*n+2)/((k+1)*binomial(2*k+2,k+1)).at n=37A120101
• Number triangle T(n,k) = lcm(1,..,2*n+2)/lcm(1,..,2*k+2).at n=37A120105
• Table read by antidiagonals: row n contains the positive integers (in order) which are coprime to the n-th prime and do not occur in earlier rows.at n=37A125703
• Numbers that are products of distinct primorial numbers (see A002110).at n=32A129912
• Denominators of 2*Sum_{k=1..n} 1/binomial(2*k,k), n >= 1.at n=8A130546
• Increasing sequence obtained by union of two sequences A136353 and {b(n)}, where b(n) is the smallest composite number m such that m-1 is prime and the set of distinct prime factors of m consists of the first n primes.at n=12A136356