id:A050718 - OEIS Search Results

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Inserting a digit '8' between adjacent digits of n makes a prime.

+0
2

11, 21, 23, 33, 39, 47, 57, 63, 77, 81, 83, 87, 93, 109, 111, 127, 129, 141, 153, 157, 177, 201, 207, 211, 213, 223, 229, 237, 267, 279, 303, 313, 319, 321, 327, 373, 417, 421, 433, 441, 447, 459, 471, 477, 483, 489, 499, 519, 541, 567, 577, 579, 589, 607 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 177 becomes 1(8)7(8)7 which is the prime 18787.`
	CROSSREFS	`Cf. A050674, A050711-A050719.` `Sequence in context: A118853 A117841 A105956 this_sequence A125164 A101223 A109686` `Adjacent sequences: A050715 A050716 A050717 this_sequence A050719 A050720 A050721`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.`

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.

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