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A126031 a(n) is largest prime < 3*a(n-1). 2
2, 5, 13, 37, 109, 317, 947, 2837, 8501, 25471, 76403, 229199, 687593, 2062759, 6188263, 18564769, 55694299, 167082893, 501248653, 1503745949, 4511237741, 13533713213, 40601139629, 121803418861, 365410256543, 1096230769619 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Artur Jasinski, Table of n, a(n) for n = 1..40

MATHEMATICA

NestList[NextPrime[3#, -1]&, 2, 30] (* Harvey P. Dale, Feb 03 2012 *)

CROSSREFS

Cf. A006902, A040016.

Sequence in context: A318485 A005961 A036249 * A151416 A193114 A114509

Adjacent sequences:  A126028 A126029 A126030 * A126032 A126033 A126034

KEYWORD

nonn

AUTHOR

Artur Jasinski, Dec 16 2006

STATUS

approved

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Last modified September 29 21:59 EDT 2020. Contains 337432 sequences. (Running on oeis4.)