A167187 - OEIS

%I #15 Oct 08 2024 06:26:09

%S 73,719,743,761,773,797,7103,7109,7127,7151,7193,7211,7229,7283,7307,

%T 7331,7349,7433,7457,7487,7499,7523,7541,7547,7577,7607,7643,7673,

%U 7691,7727,7757,7823,7829,7853,7877,7883,7907,7919,7937,71039,71069,71129,71153

%N Primes obtained from other primes by prefixing a 7.

%H Harvey P. Dale, <a href="/A167187/b167187.txt">Table of n, a(n) for n = 1..1000</a>

%e 7151 is a prime obtained by prefixing a 7 to the prime 151.

%t Select[FromDigits[Join[{7},IntegerDigits[#]]]&/@Prime[Range[250]],PrimeQ] (* _Harvey P. Dale_, Aug 08 2014 *)

%Y Cf. A000040, A165243, A165292, A165444

%K base,nonn

%O 1,1

%A _Parthasarathy Nambi_, Oct 29 2009

%E a(11)-a(42) from _Vincenzo Librandi_, Nov 01 2009

%E Corrected (a(15)=7307 inserted) by _Harvey P. Dale_, Aug 08 2014