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A067683 Phi(n)*sigma(n)+1 is prime. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

CROSSREFS

Sequence in context: A209724 A114842 A169928 * A164276 A154967 A271211

Adjacent sequences:  A067680 A067681 A067682 * A067684 A067685 A067686

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 04 2002

STATUS

approved

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Last modified July 21 06:55 EDT 2019. Contains 325192 sequences. (Running on oeis4.)