446185740

Appears in sequences

• a(n) = (1/C(2n,0) - 1/C(2n,1) + ... + d/C(2n,2n))*L, where d = (-1)^2n, L = LCM{C(2n,0), C(2n,1),..., C(2n,2n)}.at n=11A025535
• Least common multiple of {b(1),...,b(n)}, where b(k) = k(k+1)(2k+1)/6 = A000330(k).at n=10A051538
• a(n) = LCM { Catalan(0), ..., Catalan(n) }.at n=12A051575
• Numbers k which, for some r, are r-digit maximizers of k/phi(k).at n=27A065800
• Denominator of n*sum(k=1,(-1)^(k+1)/(n+k)).at n=11A082690
• Twice the primorials (first definition), 2*A002110(n).at n=8A088860
• Largest n-round number.at n=5A089016
• a(1) = 1; a(n) = smallest positive unpicked integer such that n-k divides evenly into a(n)*a(k) for every k, 1 <= k <= n-1.at n=23A091861
• Smallest m such that A097249(m) = n; from n=1 onwards, twice the primorials, 2*A002110(n).at n=9A097250
• a(h) = d(h,j) = lcm( f(h,j,1) ... f(h,j,h) ), when j=2.at n=15A097382
• Denominator of b(n), where Sum_{k>=1} b(k)/k^r = 1/(Sum_{k>=1} H(k)/k^r). H(k) = Sum_{j=1..k} 1/j, the k-th harmonic number.at n=23A097504
• Denominator of partial sums of a certain series.at n=5A101630
• Denominator of partial sums of a series for 3*(Pi-3).at n=10A130412
• Largest number which is not the sum of an n-almost prime and a prime.at n=4A152165
• a(n) = member of A025487 whose prime signature is conjugate to the prime signature of A025487(n).at n=45A181822
• Fundamental discriminant of least absolute value with class group of 2-rank n.at n=8A228251
• Least number with the prime signature of 2^n - 1.at n=47A278240
• Least number with the prime signature of 2^n + 1.at n=78A278242
• Least number with the prime signature of the n-th Catalan number.at n=20A278258
• Least number with the prime signature of the n-th Catalan number.at n=21A278258