1673196525

Appears in sequences

• Least common multiple of {1,3,5,...,2n-1}.at n=12A025547
• Denominators of alternating sum transform (PSumSIGN) of Harmonic numbers H(n) = A001008/A002805.at n=24A035047
• Denominator of (1/n)*Sum_{k=0..n-1} 1/binomial(n-1,k) for n>0 else 1.at n=25A046879
• Denominator of (1/n)*Sum_{k=0..n-1} 1/binomial(n-1,k) for n>0 else 1.at n=26A046879
• Smallest s for which there are exactly n primitive Pythagorean triangles with perimeter 2s; i.e., smallest s such that A078926(s) = n.at n=14A078927
• a(n) = denominator of 3*Sum_{j=0..n+1} 1/(2*j+1).at n=12A111877
• Denominator of the polynomial A_l(x) = Sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=2.at n=12A145612
• Denominator of the polynomial A_l(x) = Sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=8.at n=12A145624
• Numbers with exactly 8 distinct odd prime divisors {3,5,7,11,13,17,19,23}.at n=7A147581
• Odd part of lcm(1,2,3,...,n).at n=24A217858
• Odd part of lcm(1,2,3,...,n).at n=25A217858
• Denominator of Sum_{k=1..2n+1} 2^k/k.at n=12A229726
• Denominator of Sum_{k=0..n} (2^k * (k!)^2)/(2k + 1)!.at n=12A277585
• Denominators of the Kirchhoff (and Harary) index for the n-hypercube graph.at n=25A290344
• Denominators of the Kirchhoff (and Harary) index for the n-hypercube graph.at n=26A290344
• Odd numbers k for which A003973(k) >= 2*A003961(k).at n=4A337385
• Denominators of Sum_{j=0..n} 1/(2*j+1), for n >= 0.at n=12A350670
• Denominator of Sum_{k=0..n} (-1)^k / (2*k+1).at n=12A352395
• a(n) = denominator(R(2*n + 1, 2*n + 1, 1)) where R(n, k, x) = Sum_{u=0..k} ( Sum_{j=0..u} x^j * binomial(u, j) * (j + 1)^n ) / (u + 1).at n=12A362999
• a(n) = denominator(R(n, n, 1)) where R(n, k, x) = Sum_{u=0..k} ( Sum_{j=0..u} x^j * binomial(u, j) * (j + 1)^n ) / (u + 1).at n=25A363001