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A065540 a(n) is smallest prime > 3*a(n-1), a(1) = 3. 0
3, 11, 37, 113, 347, 1049, 3163, 9491, 28477, 85439, 256337, 769019, 2307059, 6921179, 20763541, 62290633, 186871907, 560615723, 1681847191, 5045541577, 15136624739, 45409874221, 136229622677, 408688868051, 1226066604179 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

MATHEMATICA

NextPrim[n_Integer] := Block[ {k = n + 1}, While[ !PrimeQ[k], k++ ]; Return[k]]; a[1] = 3; a[n_] := NextPrim[ 3*a[n - 1]]; Table[ a[n], {n, 1, 30} ]

NestList[NextPrime[3#]&, 3, 30] (* Harvey P. Dale, Jan 15 2016 *)

CROSSREFS

Sequence in context: A005422 A040017 A007615 * A084171 A192875 A118044

Adjacent sequences:  A065537 A065538 A065539 * A065541 A065542 A065543

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Nov 28 2001

STATUS

approved

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Last modified May 31 22:45 EDT 2020. Contains 334756 sequences. (Running on oeis4.)