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A006485
(2^(2^n + 1) + 1)/3.
(Formerly M2912)
+0
1
3, 11, 171, 43691, 2863311531, 12297829382473034411, 226854911280625642308916404954512140971
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Maintained by
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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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