id:A034815 - OEIS Search Results

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Concatenations C1 and C2 are both prime (see the comment lines).

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33, 51, 53, 63, 111, 123, 129, 211, 237, 273, 357, 489, 519, 573, 597, 609, 639, 651, 653, 657, 669, 681, 687, 747, 753, 819, 831, 873, 891, 987, 997, 1071, 1611, 1881, 2037, 2049, 2247, 2271, 2613, 2763, 3063, 3267, 3393, 3573, 3969, 4251, 4263, 4293 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`C1 = 'nextprime(n) followed by n'` `C2 = 'n followed by prevprime(n)'`
	EXAMPLE	`n=1881 -> next prime is 1889, previous prime is 1879, thus '18891881' and '18811879' are both primes.`
	CROSSREFS	`Cf. A034808-A034821.` `Sequence in context: A080933 A020293 A096278 this_sequence A014976 A109407 A007373` `Adjacent sequences: A034812 A034813 A034814 this_sequence A034816 A034817 A034818`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.`

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

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