id:A095958 - OEIS Search Results

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Twin prime pairs concatenated in decimal representation.

+0
4

35, 57, 1113, 1719, 2931, 4143, 5961, 7173, 101103, 107109, 137139, 149151, 179181, 191193, 197199, 227229, 239241, 269271, 281283, 311313, 347349, 419421, 431433, 461463, 521523, 569571, 599601, 617619, 641643, 659661 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) mod 3 = 0 for n>1, proof: A007953(a(n)) = 2*A007953(A001359(n)+1) and A007953(A001359(n)) mod 3 = 2 for n>1, therefore A007953(a(n)) mod 3 = 0.`
	EXAMPLE	`29 = A001359(5), 29 + 2 = 31 = A006512(5): a(5) = 2931.`
	CROSSREFS	`Cf. A045533, A001359, A006512.` `Sequence in context: A090877 A048033 A078819 this_sequence A026064 A092256 A108172` `Adjacent sequences: A095955 A095956 A095957 this_sequence A095959 A095960 A095961`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 14 2004`

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

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