A116047 n+phi(n)+phi(phi(n)) is a brilliant number (A078972).

2, 3, 6, 7, 8, 11, 73, 91, 93, 105, 109, 119, 127, 151, 157, 185, 195, 209, 223, 225, 229, 249, 289, 303, 325, 355, 371, 385, 395, 397, 401, 417, 473, 495, 545, 559, 589, 641, 665, 673, 681, 699, 709, 779, 795, 815, 821, 901, 905, 1007, 1041, 1061, 1065

Offset

1,1

Links

Table of n, a(n) for n=1..53.

Example

779+phi(779)+phi(phi(779)) = 1691 = 19*89.

Crossrefs

Cf. A078972, A116046.

Sequence in context: A069579 A327176 A065193 * A061885 A138683 A072426

Adjacent sequences: A116044 A116045 A116046 * A116048 A116049 A116050

Keyword

nonn,base

Author

Giovanni Resta, Feb 13 2006

Status

approved