24679

Appears in sequences

• a(n) = (n+1)*(n^2+n+2)/2; g.f.: (1 + 2*x^2) / (1 - x)^4.at n=36A006000
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (odd natural numbers), t = (primes).at n=33A024603
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = (primes).at n=32A025117
• a(n) = Sum_{k=1..n} lcm(n,k).at n=36A051193
• Multiplies by 2 and shifts right under the XOR BINOMIAL transform (A099901).at n=14A099902
• Stern-Jacobsthal numbers.at n=28A101624
• Number of nX6 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 nX6 array.at n=2A219576
• T(n,k) is the number of n X k arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 n X k array.at n=30A219578
• Number of 3 X n arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 3 X n array.at n=5A219580
• Numbers n such that n*A007954(n) contains the same distinct digits as n.at n=19A248039
• Sum of primes between 100*n and 100*n + 99.at n=16A276355
• Number of permutations sigma of {1,2,...,n} such that sigma(i) divides i or i divides sigma(i) for 1 <= i <= n.at n=15A320843
• Product of the larger primes, q, in the Goldbach partitions of 2n such that p + q = 2n, p <= q, and p,q prime (or 1 if no Goldbach partition of 2n exists).at n=19A362640
• The fifth term of the greedy B_n set of natural numbers.at n=35A369817