111600

Appears in sequences

• a(n) = 225*(n-1)*(n-2)/2.at n=30A027470
• Triangle read by rows: T(n,k) is the number of permutations p of [n] in which exactly the first k terms satisfy the up-down property, i.e., p(1)<p(2), p(2)>p(3), p(3)<p(4), ...at n=50A092580
• Numbers containing squares of Pythagorean triples in their divisor set.at n=30A096472
• Numbers with prime factorization pq^2r^2s^4.at n=16A190319
• Number of (w,x,y,z) with all terms in {0,...,n}, w and x odd, y even.at n=30A212762
• Number of normal multiset partitions of weight n where each part has a different size.at n=9A326517
• Coreful triperfect numbers: numbers k such that csigma(k) = 3*k, where csigma(k) is the sum of the coreful divisors of k (A057723).at n=9A364990
• Triangle read by rows: T(n,k) is the number of permutations in symmetric group S_n with (n-k) fixed points and an odd number of non-fixed point cycles. Equivalent to the number of cycles of n items with cycle type defined by non-unity partitions of k <= n that contain an odd number of parts.at n=62A373418
• Exponential abundant numbers that are not exponential unitary abundant.at n=16A391085
• Exponential Zumkeller numbers that are not exponential unitary Zumkeller numbers.at n=18A391090