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

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Examples

			sigma(55112) + phi(55112) = 131819 = 193*683.
		

Crossrefs

Cf. A078972, A115914, A115915.