

A091178


Numbers k such that kth prime is of the form 6*m+1.


15



4, 6, 8, 11, 12, 14, 18, 19, 21, 22, 25, 27, 29, 31, 34, 36, 37, 38, 42, 44, 46, 47, 48, 50, 53, 58, 59, 61, 63, 65, 67, 68, 70, 73, 74, 75, 78, 80, 82, 84, 85, 88, 90, 93, 95, 99, 100, 101, 105, 106, 110, 111, 112, 114, 115, 117, 121, 122, 125, 127, 129, 130
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OFFSET

1,1


COMMENTS

Sequence A091177 (indices of primes of the form 3*k1) is this sequence's complement in the positive integers without {2}.  M. F. Hasler, Sep 02 2016
The asymptotic density of this sequence is 1/2 (by Dirichlet's theorem).  Amiram Eldar, Feb 28 2021


LINKS



FORMULA



MATHEMATICA

Select[Range[200], IntegerQ[(Prime[#]1)/6]&] (* Harvey P. Dale, Aug 25 2013 *)


PROG

(PARI) isok(n) = !((prime(n)1) % 6); \\ Michel Marcus, Mar 04 2016


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



