This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A289056 #15 Jun 28 2017 03:05:52 %S A289056 180,240,360,1344,1872,2688,3744,5376,6048,6496 %N A289056 Near 3-perfect numbers of the form 2^a*p^t*q, where a >= 1, t = 1 or 2, p < q are both primes. %C A289056 A positive number m is called a near perfect number if the sum of its divisors (A000203) is 3*m+d, where d is a proper divisor of m. Recently [Das and Saikia] proved that there exist only 10 such numbers with the restriction in the name. %H A289056 B. Das and H. K. Saikia, <a href="http://dx.doi.org/10.18576/sjm/040101">On near 3-perfect numbers</a>, Sohag Journal of Math., Vol. 4, No. 1 (2017), 1-5. %H A289056 Paul Pollack and Vladimir Shevelev, <a href="https://doi.org/10.1016/j.jnt.2012.06.008">On perfect and near-perfect numbers</a>, J. Number Theory 132 (2012), pp. 3037-3046. %e A289056 For m=240, d=24, A000203(m) = 744 = 3*240 + d. So 240 is a member. %Y A289056 Cf. A000203, A181595. %K A289056 nonn,fini,full %O A289056 1,1 %A A289056 _Vladimir Shevelev_, Jun 23 2017