79827

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+7).at n=27A015867
• Numbers k such that phi(sigma(k)+k) = sigma(k).at n=28A068366
• Number of unimodal compositions of n+2 where the maximal part appears exactly twice.at n=32A114921
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (0, 0, 1), (1, 0, 1), (1, 1, 0)}.at n=8A151115
• Numbers k that divide sigma(k) - sigma(k-1).at n=28A227307
• Numbers k such that sigma(k) = sigma(k-1).at n=20A231546
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 0, a(1) = -1, a(2) = 0, a(3) = 1.at n=22A295735
• Numbers k such that tau(k) = 2*tau(k-1) and sigma(k) = sigma(k-1), where tau(k) and sigma(k) are respectively the number and sum functions of the divisors of k.at n=2A347603