id:A089432 - OEIS Search Results

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Numbers n such that n concatenated with floor(n/2) is prime.

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3, 7, 15, 19, 23, 27, 35, 39, 47, 55, 67, 75, 95, 99, 107, 119, 127, 135, 163, 179, 187, 195, 227, 235, 239, 243, 255, 267, 303, 319, 327, 347, 379, 407, 427, 443, 455, 459, 463, 479, 523, 539, 547, 555, 583, 607, 619, 635, 663, 667, 683, 687, 695, 715, 723 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`All terms are odd.`
	CROSSREFS	`Cf. A054211.` `Sequence in context: A117589 A143703 A098582 this_sequence A111294 A092899 A075694` `Adjacent sequences: A089429 A089430 A089431 this_sequence A089433 A089434 A089435`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 28 2003`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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