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F. Smarandache, Definitions solved and unsolved problems, conjectures and theorems in number theory and geometry, edited by M. Perez, Xiquan Publishing House 2000
F. Smarandache, Definitions, Solved and Unsolved Problems, Conjectures, ...
Sequence in context: A188551 A045782 A184112 * A026285 A013930 A004281
Adjacent sequences: A064002 A064003 A064004 * A064006 A064007 A064008
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