71610

Appears in sequences

• Areas of more than one primitive Pythagorean triangle.at n=3A024407
• Products of exactly 6 distinct primes.at n=9A067885
• Numbers with six distinct prime divisors.at n=10A074969
• Smallest number beginning with 7 and having exactly n distinct prime divisors.at n=5A077332
• Consider a Pythagorean triangle with sides a=u^2-v^2, b=2uv, c=u^2+v^2. The sequence is the area of the triangle when v=2, u=3,4,5,...at n=30A096382
• Numbers n such that the denominator of the 2n-th Bernoulli number is divisible by n but sum_{d|n} sigma(d)/phi(d) is not an integer.at n=24A099008
• Smallest number beginning with 7 that is the product of exactly n distinct primes.at n=5A106417
• Record gaps between prime quadruplets.at n=18A113404
• Squarefree positive integers of the form u*v*(u^2-v^2) for some integer u,v.at n=33A147779
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (0, -1), (0, 1), (1, 1)}.at n=11A151396
• Numbers k such that Euler phi(Dedekind psi(k)) > k.at n=2A196200
• Triangle of number of functions in a size n set for which the sequence of composition powers ends in a length k cycle.at n=26A222029
• Triangle T(n,k) represents the coefficients of (x^15*d/dx)^n, where n=1,2,3,...; generalization of Stirling numbers of second kind A008277, Lah-numbers A008297.at n=33A223517
• Upper Pythagorean twins.at n=28A228877
• Number of (n+1)X(2+1) 0..2 arrays with nondecreasing maximum of every two consecutive values in every row and column.at n=2A250614
• Number of (n+1)X(3+1) 0..2 arrays with nondecreasing maximum of every two consecutive values in every row and column.at n=1A250615
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing maximum of every two consecutive values in every row and column.at n=7A250620
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing maximum of every two consecutive values in every row and column.at n=8A250620
• a(n) = 3*(n + 1)*(n + 2)*(3*n + 1)*(3*n + 4)/4.at n=9A268685
• Number n such that there are no primes of the form sigma(n)/k where 1 < k < n is a (proper) nondivisor of n.at n=37A283147