60192

Appears in sequences

• f-triperfect numbers, where f(n) = sigma(n) and f-triperfect numbers are defined similarly to f-perfect numbers in A066218.at n=1A066731
• Smallest difference>1 between d and p/d for any divisor d of the partial product p of the sequence, starting with 9.at n=9A082124
• Slowest increasing sequence with its first 10 digits all different one from another, then the next 10, then the next 10, etc.at n=31A106604
• Exponential Riordan array (e^(mx),x*A000108(x)), m=2.at n=22A185947
• Numbers with prime factorization pqr^2s^5.at n=29A190293
• Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined below in Comments.at n=9A192384
• a(n) = Fibonacci(n) + n^3.at n=24A212272
• Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|<|y-z|.at n=19A212681
• Numbers k such that sigma(k) divides Sum_{d|k} sigma(d).at n=7A221219
• Number of 2 X n 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally.at n=9A232921
• Number of length n+5 0..2 arrays with no disjoint triples in any consecutive six terms having the same sum.at n=8A247989
• a(n) = A000041(n) * A000009(n).at n=21A304991
• Number of ways to choose 3 points that form an equilateral triangle from the A000292(n) points in a regular tetrahedral grid of side length n.at n=16A334581
• Factorial base Niven numbers (A118363) with a record gap to the next factorial base Niven number.at n=20A347495
• G.f. A(x) satisfies A(x) = 1/( 1 - 4*x*A(x)*(1 + x*A(x)) )^(1/2).at n=6A372090