id:A077523 - OEIS Search Results

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Central digit of palindromic primes.

+0
1

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; listen)

	OFFSET	`6,2`
	COMMENT	`Middle digit of terms of A002385 from 101 onwards, skipping 2, 3, 5, 7, 11 hence offset starting at 6.`
	LINKS	`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.` `Adjacent sequences: A077520 A077521 A077522 this_sequence A077524 A077525 A077526` `Sequence in context: A046086 A131977 A139125 this_sequence A107820 A064186 A134427`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 08 2002.`
	EXTENSIONS	`Edited and extended by Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 11 2003.`

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Last modified October 15 09:18 EDT 2008. Contains 145015 sequences.

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