A126031 a(n) is largest prime < 3*a(n-1).

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

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