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A082443
Palindromic primes with middle digit 7.
0
7, 373, 12721, 14741, 30703, 35753, 38783, 72727, 74747, 78787, 90709, 93739, 96769, 1117111, 1177711, 1257521, 1287821, 1317131, 1327231, 1407041, 1437341, 1447441, 1557551, 1597951, 1657561, 1707071, 1737371, 1777771, 1917191, 1957591, 1987891, 3007003, 3127213, 3187813, 3267623, 3307033, 3337333, 3417143, 3427243
OFFSET
1,1
PROG
(Magma) [ p: p in PrimesUpTo(20000000) | IsOdd(d) and D[(d+1) div 2] eq 7 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: A222870 A270247 A270228 * A082624 A332137 A261824
KEYWORD
nonn,base
AUTHOR
Lekraj Beedassy, Apr 25 2003
EXTENSIONS
1327231, 1407041 inserted and more terms from Georg Fischer, Apr 20 2024
STATUS
approved