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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.)