A116026 phi(n) plus n gives a semiprime (A001358).

4, 5, 9, 10, 11, 13, 17, 21, 26, 29, 30, 43, 45, 47, 49, 55, 57, 58, 61, 66, 67, 70, 71, 73, 75, 82, 87, 89, 99, 101, 102, 103, 106, 107, 109, 111, 115, 119, 123, 127, 129, 130, 146, 151, 153, 154, 175, 181, 182, 183, 185, 190, 191, 195, 197, 202, 203, 205, 207

Offset

1,1

Links

Table of n, a(n) for n=1..59.

Example

phi(101)+101=201=3*67.

Crossrefs

Cf. A001358, A116015.

Sequence in context: A120516 A369981 A189136 * A115915 A007536 A209887

Adjacent sequences: A116023 A116024 A116025 * A116027 A116028 A116029

Keyword

nonn

Author

Giovanni Resta, Feb 13 2006

Status

approved