A034821 - OEIS

This site is supported by donations to The OEIS Foundation.

A034821

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

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; refs; listen; history; internal format)

	OFFSET	`0,1`
	COMMENTS	`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: A076516 A145986 A200992 * A158007 A143562 A098028` `Adjacent sequences: A034818 A034819 A034820 * A034822 A034823 A034824`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 06:27 EST 2012. Contains 205998 sequences.