0,3
3^i then 3^(i+1) - 1.
Cf. A030283.
Sequence in context: A098506 A163168 A085453 this_sequence A119386 A162219 A140484
Adjacent sequences: A030436 A030437 A030438 this_sequence A030440 A030441 A030442
nonn,base
N. J. A. Sloane (njas(AT)research.att.com).
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