id:A086474 - OEIS Search Results

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a(1) = 4 and then least composite such that every partial concatenation of 2 or more terms is a prime.

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4, 21, 39, 49, 93, 99, 143, 183, 207, 231, 247, 261, 267, 531, 533, 549, 889, 999, 1167, 1641, 1701, 1809, 2019, 2327, 2349, 2469, 2553, 3043, 3093, 3123, 3159, 3639, 3857, 3937, 4197, 4221, 4233, 4323, 5271, 5369, 5611, 5661, 6641, 7599, 7819, 8021, 8043 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`421,42139 etc. are primes.`
	CROSSREFS	`Sequence in context: A041821 A042429 A161444 this_sequence A085703 A063122 A110737` `Adjacent sequences: A086471 A086472 A086473 this_sequence A086475 A086476 A086477`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy and Jason Earls (amarnath_murthy(AT)yahoo.com), Jul 22 2003`

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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.

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