A263242 Larger of emirp pairs that are merely reversals of their end digits.

31, 71, 73, 97, 311, 701, 733, 743, 751, 761, 907, 937, 941, 953, 967, 971, 983, 991, 3221, 9001, 9221, 9227, 9551, 9661, 9883, 32321, 33931, 34141, 34841, 35051, 36061, 36761, 37571, 39791, 70001, 71711, 72221, 73331, 74143, 74441, 74843, 74941, 75253, 76261, 76463, 76561

Offset

1,1

Comments

The first digit is always larger than the last digit.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..500

Mathematica

epQ[n_]:=Module[{idn=IntegerDigits[n], mid}, mid=Rest[Most[idn]]; PrimeQ[ IntegerReverse[n]]&&mid==Reverse[mid]&&idn[[1]]>idn[[-1]]]; Select[ Prime[Range[6, 8000]], epQ] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Oct 10 2016 *)

Crossrefs

Cf. A006567, A109309, A263240, A263241.

Sequence in context: A086042 A086051 A109309 * A294625 A304292 A127191

Adjacent sequences: A263239 A263240 A263241 * A263243 A263244 A263245

Keyword

nonn,base

Author

Lekraj Beedassy, Oct 13 2015

Extensions

Corrected by Harvey P. Dale, Oct 10 2016

Status

approved