0,9
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A050277.
Sequence in context: A006232 A122549 A039942 this_sequence A107808 A141045 A157411
Adjacent sequences: A050273 A050274 A050275 this_sequence A050277 A050278 A050279
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Eric Weisstein (eric(AT)weisstein.com)
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