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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 (list; graph; refs; listen; history; text; internal format)
 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 Harvey P. Dale, Table of n, a(n) for n = 1..1000 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 Cf. A002145. a(n)=A087915(n)+5 Sequence in context: A141106 A047478 A048974 * A302482 A284742 A111083 Adjacent sequences:  A089190 A089191 A089192 * A089194 A089195 A089196 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

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Last modified June 24 04:50 EDT 2021. Contains 345416 sequences. (Running on oeis4.)