id:A089785 - OEIS Search Results

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a(n) is the least prime(k) such that the concatenation of prime(k) and prime(k-n) is prime.

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5, 7, 11, 19, 17, 19, 23, 29, 31, 37, 67, 43, 83, 61, 59, 61, 67, 79, 73, 113, 97, 167, 107, 101, 103, 149, 109, 137, 167, 163, 137, 179, 149, 163, 257, 179, 277, 173, 251, 199, 191, 193, 197, 199, 211, 229, 227, 229, 233, 239, 281, 347, 283, 263, 269, 271, 283 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(4) = 19 =prime(8) and prime(8) followed by prime(8-4) =197 is prime.`
	CROSSREFS	`Cf. A089782, A089783.` `Sequence in context: A023241 A106954 A027755 this_sequence A118386 A116641 A040127` `Adjacent sequences: A089782 A089783 A089784 this_sequence A089786 A089787 A089788`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 24 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Oct 13 2005`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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