A067683 Phi(n)*sigma(n)+1 is prime.

1, 8, 9, 10, 12, 15, 20, 28, 30, 32, 35, 36, 42, 45, 50, 54, 58, 60, 70, 80, 92, 93, 95, 100, 110, 114, 122, 123, 124, 125, 130, 132, 142, 143, 145, 152, 155, 162, 165, 168, 169, 171, 172, 174, 175, 176, 178, 180, 183, 185, 186, 195, 198, 200, 204, 209, 212, 216

Offset

1,2

Links

Table of n, a(n) for n=1..58.

Crossrefs

Sequence in context: A209724 A114842 A169928 * A338026 A359881 A164276

Adjacent sequences: A067680 A067681 A067682 * A067684 A067685 A067686

Keyword

nonn

Author

Benoit Cloitre, Feb 04 2002

Status

approved