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A152417
A fives sequence: a(n)=(5^n - 1)/(2^(3 - Mod[n, 2])).
+0
1
0, 1, 3, 31, 78, 781, 1953, 19531, 48828, 488281, 1220703, 12207031, 30517578, 305175781, 762939453, 7629394531, 19073486328, 190734863281, 476837158203, 4768371582031, 11920928955078, 119209289550781, 298023223876953
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
AT&T Labs Research
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