id:A121608 - OEIS Search Results

Search: id:A121608

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Primes that can be written as concatenation of two composite numbers in decimal representation.

+0
4

89, 109, 149, 229, 269, 349, 359, 389, 409, 421, 433, 439, 449, 457, 463, 487, 491, 499, 509, 569, 659, 677, 691, 709, 769, 809, 821, 827, 829, 839, 857, 859, 863, 877, 881, 887, 919, 929, 977, 991, 1009, 1021, 1033, 1039, 1049, 1051, 1063, 1069, 1087, 1091 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`A000040(169) = 1009 = 10010+9 = A002808(74)10+A002808(4),` `therefore 1009 is a term: a(41) = 1009;` `A000040(172) = 1021 = 10100+21 = A002808(5)100+A002808(12),` `therefore 1021 is a term: a(42) = 1021.`
	CROSSREFS	`Cf. A105184, A121609, A121610.` `Sequence in context: A146332 A146352 A050956 this_sequence A135144 A083371 A124583` `Adjacent sequences: A121605 A121606 A121607 this_sequence A121609 A121610 A121611`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 10 2006`

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

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