id:A057628 - OEIS Search Results

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Primes such that replacing each digit d with d copies of the digit d produces a prime. Zeros are not allowed.

+0
4

11, 31, 53, 131, 149, 223, 283, 311, 313, 331, 397, 463, 641, 691, 937, 941, 1439, 1511, 1741, 1871, 1949, 1993, 1999, 2111, 2447, 2939, 3163, 3391, 3433, 3499, 3559, 3593, 3659, 3911, 3931, 5227, 5399, 5923, 6163, 6269, 6653, 6719, 7177, 7741, 8389 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 641 becomes 66666644441 which is also prime.`
	CROSSREFS	`Cf. A057630.` `Sequence in context: A043904 A031287 A057630 this_sequence A031372 A028877 A087394` `Adjacent sequences: A057625 A057626 A057627 this_sequence A057629 A057630 A057631`
	KEYWORD	`nonn,base,nice,easy`
	AUTHOR	`G. L. Honaker, Jr. (honak3r(AT)bvunet.net), Oct 10 2000`
	EXTENSIONS	`More terms from Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 2000.`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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