284130

Appears in sequences

• Least common multiple of all (k+1)'s, where the k's are the positive divisors of n.at n=39A057643
• Triangle read by rows: T(n,k) is the number of labeled commutative semigroups of order n with k idempotents.at n=16A058167
• a(n) = (2^(n-1)/(2n)!)*Product_{k=1..n} q(k) where q(n) is the denominator of B(2n), the 2n-th Bernoulli number.at n=19A069267
• a(n) = 169*n^2 + n.at n=40A173275
• a(n) = sigma(n)*Fibonacci(n), where sigma(n) = A000203(n), the sum of divisors of n.at n=19A203848
• Least positive integer k such that k and k*n are terms of A259539.at n=12A259540
• Averages k of twin prime pairs such that A075255(k) is also the average of a twin prime pair.at n=31A340570
• Denominators of coefficients in expansion of e.g.f. x / (1 + 2*x - exp(x)).at n=40A347427