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 A225937 Number of conjugacy classes in adjoint Chevalley group E_7(q) as q runs through the prime powers. 2
 531, 4569, 24553, 105644, 992834, 2447517, 5477205, 21674822, 68494004, 287617189, 437805224, 946620206, 3567305234, 6369359984, 10879403385, 17889596996, 28462405562, 35505127221, 97646355404, 199751157632, 278452165094, 517886829194, 692659723976 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Eric M. Schmidt, Table of n, a(n) for n = 1..1000 Frank Luebeck, Numbers of Conjugacy Classes in Finite Groups of Lie Type. FORMULA Let q be the n-th prime power. Then, a(n) is q^7 + q^6 + 2q^5 + 4q^4 + 10q^3 + 15q^2 + 25q + 21 if q == 0 (mod 2); q^7 + q^6 + 2q^5 + 5q^4 + 13q^3 + 24q^2 + 46q + 57 if q == 0 (mod 3); q^7 + q^6 + 2q^5 + 5q^4 + 13q^3 + 24q^2 + 47q + 59 otherwise. PROG (Sage) def A225937(q) : return q^7 + q^6 + 2*q^5 + (4*q^4 + 10*q^3 + 15*q^2 + 25*q + 21 if q%2==0 else 5*q^4 + 13*q^3 + 24*q^2 + 46*q + 57 if q%3==0 else 5*q^4 + 13*q^3 + 24*q^2 + 47*q + 59) CROSSREFS Cf. A188161, A224790, A225928 - A225938. Sequence in context: A156772 A031701 A158367 * A225936 A098257 A174780 Adjacent sequences:  A225934 A225935 A225936 * A225938 A225939 A225940 KEYWORD nonn AUTHOR Eric M. Schmidt, May 21 2013 STATUS approved

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Last modified August 5 10:38 EDT 2021. Contains 346466 sequences. (Running on oeis4.)