%I
%S 0,1,3,4,6,9,10,12,13,15,16,19,22,25,27,30,31,33,34,36,39,45,46,48,54,
%T 55,57,58,60,61,64,67,72,75,78,79,82,85,87,88,90,93,94,96,97,99,108,
%U 109,111,118,121,123,127,129,130,132,136,142,144,148,156,159,160,162,163
%N Numbers k such that 10k + 7 is prime.
%C Solutions of the equation (10*k+7)'=1, where k' is the arithmetic derivative of k.  _Paolo P. Lava_, Nov 15 2012
%e 10*1 + 7 = 17 (prime);
%e 10*48 + 7 = 487 (prime);
%e 10*99 + 7 = 997 (prime).
%t Select[Range[0, 170], PrimeQ[10# + 7] &] (* _Ray Chandler_, Nov 07 2006 *)
%o (MAGMA) [n: n in [0..3000] IsPrime(10*n+7)]; // _Vincenzo Librandi_, Apr 06 2011
%o (PARI) is(n)=isprime(10*n+7) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y Cf. A030432, A049509.
%K nonn
%O 1,3
%A _Parthasarathy Nambi_, Feb 20 2005
%E Edited and extended by _Ray Chandler_, Nov 07 2006
