id:A077361 - OEIS Search Results

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Smallest n-digit prime whose external digits as well as internal digits form a prime, or 0 if no such number exists.

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0, 0, 127, 1021, 10037, 100057, 1000033, 10000079, 100000037, 1000000021, 10000000033, 100000000057, 1000000000039, 10000000000037, 100000000000031, 1000000000000037, 10000000000000079, 100000000000000021 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Conjecture: no entry is zero for n>2.`
	CROSSREFS	`Cf. A069686, A077359, A077360, A077362.` `Sequence in context: A060201 A140630 A075942 this_sequence A038994 A068023 A025598` `Adjacent sequences: A077358 A077359 A077360 this_sequence A077362 A077363 A077364`
	KEYWORD	`base,hard,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 05 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 11 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research