id:A050714 - OEIS Search Results

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Inserting a digit '4' between adjacent digits of n makes a prime.

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19, 21, 37, 39, 43, 49, 51, 57, 61, 63, 67, 73, 91, 97, 113, 119, 123, 129, 131, 137, 147, 149, 153, 159, 171, 177, 183, 197, 203, 209, 227, 243, 257, 279, 281, 287, 293, 311, 317, 353, 359, 369, 377, 381, 383, 387, 389, 399, 401, 429, 449, 453, 459, 461, 467 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 389 becomes 3(4)8(4)9 which is prime 34849.`
	CROSSREFS	`Cf. A050674, A050711-A050719.` `Sequence in context: A020347 A054864 A158232 this_sequence A113868 A023152 A056025` `Adjacent sequences: A050711 A050712 A050713 this_sequence A050715 A050716 A050717`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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