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A152854 Numbers n such that either 2n+3 is not prime or 4n+7 is not prime. 1
2, 3, 5, 6, 7, 8, 9, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A152843: Numbers n such that both 2n+3 and 4n+7 are prime.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[100], !PrimeQ[2#+3]||!PrimeQ[4#+7]&] (* Harvey P. Dale, Jan 18 2012 *)

PROG

(MAGMA) [n: n in [0..90] | not IsPrime(2*n+3) or not IsPrime(4*n+7)]; // Vincenzo Librandi, Oct 20 2012

CROSSREFS

Sequence in context: A285964 A198045 A068998 * A341763 A201144 A095274

Adjacent sequences:  A152851 A152852 A152853 * A152855 A152856 A152857

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Dec 14 2008

EXTENSIONS

Edited and extended by Klaus Brockhaus, Dec 23 2008

STATUS

approved

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Last modified April 18 16:51 EDT 2021. Contains 343089 sequences. (Running on oeis4.)