2147581952

Appears in sequences

• Numbers m whose abundance sigma(m) - 2m = -4. Numbers whose deficiency is 4.at n=14A125246
• Number of -1..1 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having two or four distinct values for every i,j,k<=n.at n=29A211525
• Numbers that are equal to the arithmetic derivative of the sum of their aliquot parts.at n=10A248816
• a(n) = 2^(n-1)*(2^n+3).at n=16A257273
• Number of monomials in c(n) where c(1) = x, c(2) = y, c(n+2) = c(n+1) + c(n)^2.at n=34A290075
• Numbers k such that k - 2 | sigma(k).at n=17A298563