|
%I #11 Oct 30 2023 17:12:31
%S 73,79,83,89,271,281,373,379,383,389,673,683,709,739,773,809,839,883,
%T 1171,1181,1279,1289,1471,1481,1723,1783,1789,1823,1873,1879,2371,
%U 2381,2719,2789,2819,2879,3079,3089,3571,3581,3733,3779,3833,3889,4273,4283
%N Primes that become a different prime under the mapping 7 <=> 8.
%H Robert Price, <a href="/A180558/b180558.txt">Table of n, a(n) for n = 1..1582</a>
%H <a href="/index/Pri#primes">Index to Primes</a>, Primes that become a different prime under some mapping.
%t fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 7] || MemberQ[id, 8]) && PrimeQ[ FromDigits[ id /. {7 -> 8, 8 -> 7}] ]]; Select[ Prime@ Range@ 600, fQ]
%Y Cf. A171048, A175791, A180517 thru A180559, A175789, A180560, A180561.
%K base,nonn
%O 1,1
%A _Zak Seidov_ and _Robert G. Wilson v_, Sep 09 2010
|
