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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: A139528 A117290 A045782 this_sequence A026285 A013930 A004281
Adjacent sequences: A064002 A064003 A064004 this_sequence A064006 A064007 A064008
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