1,2
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: A019014 A128595 A111195 this_sequence A003095 A023362 A138613
Adjacent sequences: A064003 A064004 A064005 this_sequence A064007 A064008 A064009
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