id:A121609 - OEIS Search Results

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Composite numbers that can be written as concatenation of two primes in decimal representation.

+0
5

22, 25, 27, 32, 33, 35, 52, 55, 57, 72, 75, 77, 112, 115, 117, 132, 133, 135, 172, 175, 177, 192, 195, 213, 217, 219, 231, 232, 235, 237, 243, 247, 253, 259, 261, 267, 273, 279, 289, 292, 295, 297, 312, 315, 319, 323, 329, 341, 343, 361, 371, 372, 375, 377 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Subsequence of A066737.`
	EXAMPLE	`A002808(249) = 315 = 3110+5 = A000040(11)10+A000040(3),` `therefore 315 is a term: a(44) = 315;` `A002808(252) = 319 = 3100+19 = A000040(2)100+A000040(8),` `therefore 319 is a term: a(45) = 319.`
	CROSSREFS	`Cf. A121610, A105184, A121608.` `Adjacent sequences: A121606 A121607 A121608 this_sequence A121610 A121611 A121612` `Sequence in context: A053779 A034304 A066737 this_sequence A092631 A061371 A070809`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 10 2006`

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Last modified November 8 19:30 EST 2009. Contains 166227 sequences.

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