id:A088712 - OEIS Search Results

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Primes which when concatenated with the previous prime form a new prime.

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5, 53, 59, 67, 137, 179, 211, 223, 239, 263, 359, 541, 593, 613, 631, 653, 659, 757, 809, 977, 997, 1009, 1109, 1129, 1237, 1399, 1559, 1783, 1931, 1979, 1993, 2309, 2339, 2347, 2411, 2683, 2879, 3061, 3203, 3271, 3613, 3643, 3767, 4001 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`If isprime(p(n) & p(n-1)) then sequence.add(p(n))`
	EXAMPLE	`a(2) = 53 because 53 concatenated with the preceding prime (47) yields 5347 which is also prime.`
	CROSSREFS	`Cf. A088784.` `Sequence in context: A099977 A001173 A107803 this_sequence A090153 A103654 A079385` `Adjacent sequences: A088709 A088710 A088711 this_sequence A088713 A088714 A088715`
	KEYWORD	`base,nonn`
	AUTHOR	`Chuck Seggelin (barkeep(AT)plasteredDragon.com), Oct 15 2003`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research