id:A050712 - OEIS Search Results

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Inserting a digit '2' between adjacent digits of n makes a prime.

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17, 23, 27, 29, 41, 51, 53, 77, 81, 83, 87, 89, 99, 127, 133, 139, 141, 157, 171, 181, 183, 189, 193, 207, 213, 219, 229, 261, 271, 277, 291, 307, 309, 331, 333, 337, 343, 349, 361, 403, 421, 423, 427, 433, 477, 481, 489, 493, 499, 501, 507, 511, 517, 523 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 333 becomes 3(2)3(2)3 which is prime 32323.`
	CROSSREFS	`Cf. A050674, A050711-A050719.` `Sequence in context: A158246 A002252 A064543 this_sequence A068581 A166864 A137670` `Adjacent sequences: A050709 A050710 A050711 this_sequence A050713 A050714 A050715`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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