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A024914 Numbers k such that 10*k - 3 is prime. 1
1, 2, 4, 5, 7, 10, 11, 13, 14, 16, 17, 20, 23, 26, 28, 31, 32, 34, 35, 37, 40, 46, 47, 49, 55, 56, 58, 59, 61, 62, 65, 68, 73, 76, 79, 80, 83, 86, 88, 89, 91, 94, 95, 97, 98, 100, 109, 110, 112, 119, 122, 124, 128, 130, 131, 133, 137, 143, 145, 149, 157, 160, 161, 163, 164, 166, 167 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Solutions of the equation (10*n-3)' = 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) = 1 + A102342(n). - R. J. Mathar, Sep 25 2013

MAPLE

select(k->isprime(10*k-3), [$1..170]); # Muniru A Asiru, Jul 15 2018

MATHEMATICA

a={}; Do[x=10*n-3; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; a (* Vladimir Joseph Stephan Orlovsky, Apr 29 2008 *)

Select[Range[200], PrimeQ[10#-3]&] (* Harvey P. Dale, Nov 22 2012 *)

PROG

(MAGMA) [n: n in [1..200] |IsPrime(10*n-3)]; // Vincenzo Librandi, Nov 19 2010

(PARI) is(n)=isprime(10*n-3) \\ Charles R Greathouse IV, Jun 06 2017

CROSSREFS

Sequence in context: A133254 A080725 A182337 * A189636 A117741 A019271

Adjacent sequences:  A024911 A024912 A024913 * A024915 A024916 A024917

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 7 09:41 EDT 2021. Contains 343649 sequences. (Running on oeis4.)