A115916 Numbers k such that sigma(k) + phi(k) is a brilliant number (A078972).
2, 3, 4, 5, 6, 7, 128, 144, 400, 576, 1296, 8100, 11664, 13225, 15129, 34969, 40000, 44944, 55112, 60025, 63368, 67712, 69938, 91809, 103058, 135424, 157922, 203401, 861184, 1034289, 1258884, 1270418, 1435204, 1440000, 1575025
Offset: 1
Examples
sigma(55112) + phi(55112) = 131819 = 193*683.