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A335000
Orders of the groups PSL(m,q) in increasing order as q runs through the prime powers (with repetitions).
4
6, 12, 60, 60, 168, 168, 360, 504, 660, 1092, 2448, 3420, 4080, 5616, 6072, 7800, 9828, 12180, 14880, 20160, 20160, 25308, 32736, 34440, 39732, 51888, 58800, 74412, 102660, 113460, 150348, 178920, 194472, 246480, 262080, 265680, 285852, 352440, 372000, 456288, 515100, 546312
OFFSET
1,1
COMMENTS
60 is the order of PSL(2,4) and of PSL(2,5).
168 is the order of PSL(2,7) and of PSL(3,2).
20160 is the order of PSL(4,2) and of PSL(3,4).
Other repetitions > 20160 for PSL(m,q) groups are not known.
See A334884 and A334994 for variations of this sequence.
FORMULA
#PSL(m,q) = (Product_{j=0..m-2} (q^m - q^j)) * q^(m-1) / gcd(m,q-1). - Bernard Schott, May 19 2020
EXAMPLE
a(5) = #PSL(2,7) = (7^2-1)*7/gcd(2,6) = 168, and,
a(6) = #PSL(3,2) = (2^3-1)*(2^3-2)*2^2/gcd(3,1) = 168.
CROSSREFS
Cf. A002884 \ {1} (PSL(n,2)), A117762 (PSL(2, prime(n))).
Cf. A334884 (another case with repetitions), A334994 (without repetitions).
Sequence in context: A337739 A076305 A088944 * A352806 A033931 A228847
KEYWORD
nonn
AUTHOR
Michel Marcus, May 19 2020
STATUS
approved