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

1,1

Links

Table of n, a(n) for n=1..35.

Example

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

Crossrefs

Cf. A078972, A115914, A115915.

Sequence in context: A037441 A270436 A004869 * A065667 A099146 A073789

Adjacent sequences: A115913 A115914 A115915 * A115917 A115918 A115919

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved