A082440 Palindromic primes with middle digit 4.

11411, 12421, 15451, 17471, 18481, 30403, 32423, 77477, 78487, 96469, 1074701, 1114111, 1134311, 1374731, 1444441, 1464641, 1594951, 1654561, 1684861, 1714171, 1734371, 1764671, 1824281, 1884881, 1924291, 1984891, 3064603, 3304033

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Prog

(Magma) [ p: p in PrimesUpTo(200000000) | IsOdd(d) and D[(d+1) div 2] eq 4 and D eq Reverse(D) where d is #D where D is Intseq(p) ]; // Vincenzo Librandi, Apr 12 2011

Crossrefs

Cf. A002385.

Sequence in context: A268841 A235016 A185768 * A083975 A157655 A262399

Adjacent sequences: A082437 A082438 A082439 * A082441 A082442 A082443

Keyword

nonn,base

Author

Lekraj Beedassy, Apr 25 2003

Extensions

a(9) from Vincenzo Librandi, Apr 12 2011

Status

approved