This site is supported by donations to The OEIS Foundation.

 Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A105133 Numbers n such that 8n + 5 is prime. 17
 0, 1, 3, 4, 6, 7, 12, 13, 18, 19, 21, 22, 24, 28, 33, 34, 36, 39, 43, 46, 48, 49, 52, 57, 63, 67, 69, 76, 81, 82, 84, 87, 88, 91, 94, 96, 99, 102, 103, 106, 109, 117, 124, 126, 127, 132, 133, 136, 138, 139, 147, 151, 153, 154, 159, 162, 171, 172, 178, 181, 186, 193, 199, 201, 202 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Solutions of the equation (8*n+5)'=1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Jan 03 2013 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 FORMULA a(n) = (A007521(n)-5)/8. - Zak Seidov, Sep 08 2015 MAPLE M:=500; f:=proc(n) local t1, t2; t1:=[]; for k from 0 to M do t2:=2^n*k+2^(n-1)+1; if isprime(t2) then t1:=[op(t1), k]; fi; od; t1; end; f(3); MATHEMATICA Select[Range[0, 300], PrimeQ[8 # + 5]&] (* Vincenzo Librandi, Jan 07 2013 *) PROG (MAGMA) [n: n in [0..500] | IsPrime(8*n+5)];  // Vincenzo Librandi, Jan 07 2013 (PARI) is(n)=isprime(8*n+5) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A095278, A105134-A105140, A002145, A007521, A105126-A105132. Sequence in context: A060965 A153883 A033162 * A211384 A281828 A002982 Adjacent sequences:  A105130 A105131 A105132 * A105134 A105135 A105136 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, based on correspondence from Marco Matosic, Apr 11 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 23 19:08 EST 2017. Contains 295128 sequences.