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A060679 Orders of non-cyclic groups. 6
4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 34, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 66, 68, 70, 72, 74, 75, 76, 78, 80, 81, 82, 84, 86, 88, 90, 92, 93, 94, 96, 98, 99, 100, 102, 104, 105, 106, 108 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers n such that x^n==1 (mod n) has solutions 2<=x<=n - Benoit Cloitre, May 10 2002

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = n + O(n/log log log n). - Charles R Greathouse IV, Apr 16 2012

PROG

(PARI) is(n)=gcd(n, eulerphi(n))>1 \\ Charles R Greathouse IV, Apr 16 2012

CROSSREFS

Complement of A003277.

Sequence in context: A117097 A077135 A110615 * A051234 A327776 A102554

Adjacent sequences:  A060676 A060677 A060678 * A060680 A060681 A060682

KEYWORD

nonn

AUTHOR

Ahmed Fares (ahmedfares(AT)my-deja.com), Apr 19 2001

EXTENSIONS

More terms from Vladeta Jovovic, Jul 05 2001

STATUS

approved

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Last modified October 15 01:40 EDT 2019. Contains 328025 sequences. (Running on oeis4.)