id:A083192 - OEIS Search Results

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a(1) = 1, then the rearrangement of composite numbers such that the concatenation of n terms from the n-th term is a prime. (Concatenation of n-th term to (2n-1)th term is a prime number).

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1, 4, 21, 6, 49, 8, 77, 9, 39, 10, 81, 12, 221, 14, 63, 15, 203, 16, 143, 18, 511, 20, 217, 22, 279, 24, 299, 25, 319, 26, 33, 27, 147, 28, 943, 30, 121, 32, 87, 34, 333, 35, 781, 36, 249, 38, 679, 40, 99, 42, 117, 44, 1463, 45, 697, 46, 187, 48, 207, 50, 219, 51, 639, 52 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`421, 21649, etc. are primes.`
	CROSSREFS	`Cf. A083193.` `Sequence in context: A074195 A146342 A103896 this_sequence A128452 A144292 A076943` `Adjacent sequences: A083189 A083190 A083191 this_sequence A083193 A083194 A083195`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 27 2003`
	EXTENSIONS	`Corrected a(11)=81 and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 04 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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