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A091177 Numbers n such that the n-th prime is of the form 3k-1. 8
1, 3, 5, 7, 9, 10, 13, 15, 16, 17, 20, 23, 24, 26, 28, 30, 32, 33, 35, 39, 40, 41, 43, 45, 49, 51, 52, 54, 55, 56, 57, 60, 62, 64, 66, 69, 71, 72, 76, 77, 79, 81, 83, 86, 87, 89, 91, 92, 94, 96, 97, 98, 102, 103, 104, 107, 108, 109, 113, 116, 118, 119, 120, 123, 124, 126 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A003627 indexed by A000040.

LINKS

Table of n, a(n) for n=1..66.

FORMULA

a(n)=k such that A000040(k) = A003627(n).

MATHEMATICA

PrimePi/@Select[3Range[0, 250]-1, PrimeQ]  (* Harvey P. Dale, Apr 26 2011 *)

CROSSREFS

A003627 gives primes arising in A024893, A087370, A088879.

A133677 is another version.

Sequence in context: A080207 A187347 A187413 * A066929 A173909 A165249

Adjacent sequences:  A091174 A091175 A091176 * A091178 A091179 A091180

KEYWORD

easy,nonn

AUTHOR

Ray Chandler, Dec 26 2003

STATUS

approved

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Last modified November 17 08:39 EST 2019. Contains 329217 sequences. (Running on oeis4.)