id:A034821 - OEIS Search Results

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

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5, 17, 103, 127, 157, 191, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 227, 234, 235, 236, 237, 238, 258, 259, 260, 261, 262, 307, 347, 354, 355, 356, 357, 358, 431, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`C1 = 'prevprime(n) followed by nextprime(n)'` `C2 = 'nextprime(n) followed by prevprime(n)'`
	EXAMPLE	`n=17 -> next prime is 19, previous prime is 13, thus '1319' and '1913' are both primes.`
	CROSSREFS	`Cf. A034808-A034820.` `Sequence in context: A145824 A076516 A145986 this_sequence A158007 A143562 A098028` `Adjacent sequences: A034818 A034819 A034820 this_sequence A034822 A034823 A034824`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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