id:A050715 - OEIS Search Results

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Inserting a digit '5' between adjacent digits of n makes a prime.

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11, 17, 21, 27, 33, 39, 47, 57, 63, 69, 71, 77, 83, 87, 89, 93, 103, 129, 139, 141, 151, 159, 189, 199, 207, 213, 223, 237, 243, 247, 267, 279, 291, 301, 303, 309, 313, 319, 321, 327, 333, 373, 379, 381, 391, 403, 429, 453, 457, 469, 471, 477, 483, 493, 499 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 373 becomes 3(5)7(5)3 which is prime 35753.`
	CROSSREFS	`Cf. A050674, A050711-A050719.` `Sequence in context: A032677 A050879 A050669 this_sequence A006618 A066074 A106563` `Adjacent sequences: A050712 A050713 A050714 this_sequence A050716 A050717 A050718`
	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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