id:A050719 - OEIS Search Results

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Inserting a digit '9' between adjacent digits of n makes a prime.

+0
14

11, 13, 17, 19, 23, 37, 41, 49, 53, 59, 61, 77, 91, 97, 131, 157, 167, 169, 173, 181, 191, 193, 197, 211, 227, 239, 259, 307, 311, 319, 323, 337, 349, 371, 379, 413, 419, 427, 431, 433, 449, 457, 467, 481, 491, 493, 499, 503, 517, 533, 539, 547, 563, 569, 571 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 181 becomes 1(9)8(9)1 which is prime 19891.`
	CROSSREFS	`Cf. A050674, A050711-A050718.` `Sequence in context: A038842 A046117 A091923 this_sequence A098415 A067283 A052259` `Adjacent sequences: A050716 A050717 A050718 this_sequence A050720 A050721 A050722`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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