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A146111
Bell numbers (A000110) read mod 21.
7
1, 1, 2, 5, 15, 10, 14, 16, 3, 0, 13, 18, 10, 16, 19, 17, 20, 3, 7, 5, 7, 15, 9, 16, 3, 19, 19, 1, 17, 11, 12, 1, 17, 13, 18, 0, 16, 6, 4, 16, 10, 11, 2, 15, 10, 20, 19, 0, 6, 10, 18, 16, 4, 19, 20, 2, 0, 13, 20, 16, 18, 15, 16, 6, 19, 1, 13, 5, 17, 15, 4, 20, 7, 18, 15, 4, 12, 10, 13, 4, 5
OFFSET
0,3
LINKS
W. F. Lunnon, P. A. B. Pleasants, and N. M. Stephens, Arithmetic properties of Bell numbers to a composite modulus I, Acta Arithmetica 35 (1979), pp. 1-16.
FORMULA
a(n+1784341) = a(n). - G. C. Greubel, Feb 02 2016
MATHEMATICA
Mod[BellB[Range[0, 80]], 21] (* Harvey P. Dale, Sep 04 2012 *)
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 07 2009
STATUS
approved