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A077523 Central digit of palindromic primes. 0
0, 3, 5, 8, 9, 1, 5, 7, 8, 2, 5, 8, 9, 1, 2, 3, 5, 6, 3, 4, 4, 7, 8, 3, 8, 9, 3, 7, 4, 5, 0, 3, 5, 6, 4, 9, 1, 4, 3, 8, 9, 1, 2, 4, 7, 8, 0, 5, 3, 4, 5, 5, 8, 0, 1, 3, 7, 2, 5, 2, 5, 0, 1, 7, 2, 2, 5, 6, 3, 9, 2, 7, 0, 2, 6, 0, 7, 5, 3, 6, 3, 4, 9, 4, 7, 8, 3, 6, 9, 7, 0, 1, 2, 7, 0, 3, 6, 8, 9, 9, 2, 4, 7, 3, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

COMMENTS

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

LINKS

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

P. De Geest, World!Of Palindromic Primes

MATHEMATICA

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

CROSSREFS

Cf. A002385.

Sequence in context: A131977 A139125 A186697 * A298516 A157291 A107820

Adjacent sequences:  A077520 A077521 A077522 * A077524 A077525 A077526

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 08 2002.

EXTENSIONS

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

STATUS

approved

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Last modified October 21 08:16 EDT 2019. Contains 328292 sequences. (Running on oeis4.)