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A089193
Odd numbers n such that 2*n-7 is a prime of the form 4*k+3.
4
5, 7, 9, 13, 15, 19, 25, 27, 33, 37, 39, 43, 45, 55, 57, 67, 69, 73, 79, 85, 87, 93, 99, 103, 109, 115, 117, 123, 129, 135, 139, 145, 157, 159, 169, 177, 183, 187, 193, 195, 213, 219, 223, 225, 235, 237, 243, 247, 249, 253, 255, 265, 277, 285, 289, 297, 303
OFFSET
1,1
REFERENCES
M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988.
Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997.
LINKS
FORMULA
a(n) = A087915(n) + 5.
MATHEMATICA
tn7Q[n_]:=Module[{c=2n-7}, PrimeQ[c]&&Divisible[c-3, 4]]; Select[Range[ 5, 301, 2], tn7Q] (* Harvey P. Dale, May 18 2021 *)
CROSSREFS
Sequence in context: A141106 A047478 A048974 * A302482 A284742 A111083
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Dec 08 2003
EXTENSIONS
Offset corrected by Arkadiusz Wesolowski, Aug 09 2011
Corrected and extended by Harvey P. Dale, May 18 2021
STATUS
approved