A167187 Primes obtained from other primes by prefixing a 7.
73, 719, 743, 761, 773, 797, 7103, 7109, 7127, 7151, 7193, 7211, 7229, 7283, 7307, 7331, 7349, 7433, 7457, 7487, 7499, 7523, 7541, 7547, 7577, 7607, 7643, 7673, 7691, 7727, 7757, 7823, 7829, 7853, 7877, 7883, 7907, 7919, 7937, 71039, 71069, 71129, 71153
Offset: 1
Examples
7151 is a prime obtained by prefixing a 7 to the prime 151.
Links
- Harvey P. Dale, Table of n, a(n) for n = 1..1000
Programs
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Mathematica
Select[FromDigits[Join[{7},IntegerDigits[#]]]&/@Prime[Range[250]],PrimeQ] (* Harvey P. Dale, Aug 08 2014 *)
Extensions
a(11)-a(42) from Vincenzo Librandi, Nov 01 2009
Corrected (a(15)=7307 inserted) by Harvey P. Dale, Aug 08 2014