6,2

Middle digit of terms of A002385 from 101 onwards, skipping 2, 3, 5, 7, 11 hence offset starting at 6.

Table of n, a(n) for n=6..110.

P. De Geest, World!Of Palindromic Primes

a = {}; Do[pp = IntegerDigits[ Prime[n]]; If[pp == Reverse[pp], a = Append[a, pp[[(Length[pp] + 1)/2]]]], {n, 6, 9385}]; a

Cf. A002385.

Sequence in context: A131977 A139125 A186697 * A298516 A157291 A107820

Adjacent sequences: A077520 A077521 A077522 * A077524 A077525 A077526

base,nonn

Amarnath Murthy, Nov 08 2002.

Edited and extended by Patrick De Geest, Jun 11 2003.

approved