38088

Appears in sequences

• Numbers k such that the number of steps to reach 1 in '3x+1' problem equals tau(k), the number of divisors of k.at n=46A070980
• Numbers of the form p^3*q^2*r^2 where p, q, and r are distinct primes.at n=19A179695
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,0,1,4,1,0,1 for x=0,1,2,3,4,5,6.at n=6A197902
• Number of (n+2) X 3 binary arrays avoiding patterns 001 and 101 in rows and columns.at n=20A202195
• Number of (w,x,y) with all terms in {0,...,n} and 2*max(w,x,y) > 3*min(w,x,y).at n=34A213393
• Number of 2 X 2 planar subsets in an n X n X n cube.at n=24A270205
• Consider all 3 X 3 matrices M whose entries are the n-th to (n+8)-th primes prime(n), ..., prime(n+8), in any order. a(n) is the sum of the number of M such that det(M) is divisible by prime(n+i), for i from 0 to 8.at n=18A339105
• Refactorable numbers that are twice a square.at n=34A376114
• Achilles numbers sandwiched between two semiprimes.at n=20A380937
• Numbers k such that k + A224787(k) is a square.at n=17A386640