54033

Appears in sequences

• Numbers k such that sigma(sigma(sigma(k))) == 6*sigma(k).at n=40A067065
• Integer part of the logarithmic integral of the logarithmic integral of 10^n.at n=6A096353
• Triangle in A071943 with rows reversed.at n=57A108073
• Numbers of the form m = p1 * p2 * p3 * p4 where for each d|m we have (d+m/d)/2 prime and p1 < p2 < p3 < p4 each prime.at n=9A128285
• a(n) = 100*n^2 - 151*n + 57.at n=23A157626
• Number of arrays of -2..2 integers x(1..n) with every x(i) in a subsequence of length 1 or 2 with sum zero.at n=10A193642
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<=3z.at n=17A212509
• Numbers k that divide the k-th Apéry number (A005258).at n=25A372943