A082441 - OEIS

%I #13 Sep 08 2022 08:45:10

%S 5,151,353,757,10501,15551,16561,31513,33533,34543,36563,37573,70507,

%T 75557,97579,1035301,1055501,1065601,1085801,1145411,1175711,1215121,

%U 1235321,1245421,1335331,1535351,1565651,1685861,1695961,1755571,1805081,1865681,1895981

%N Palindromic primes with middle digit 5.

%o (Magma) [ p: p in PrimesUpTo(200000000) | IsOdd(d) and D[(d+1) div 2] eq 5 and D eq Reverse(D) where d is #D where D is Intseq(p) ]; // _Vincenzo Librandi_, Apr 12 2011

%Y Cf. A002385.

%K nonn,base

%O 1,1

%A _Lekraj Beedassy_, Apr 25 2003

%E a(3), a(12), a(27), a(29) from _Vincenzo Librandi_, Apr 12 2011