id:A034816 - OEIS Search Results

Search: id:A034816

Displaying 1-1 of 1 results found.

page 1

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

+0
1

9, 51, 63, 117, 123, 157, 183, 213, 217, 219, 257, 263, 321, 327, 333, 423, 441, 473, 541, 597, 621, 687, 693, 723, 777, 879, 909, 987, 1101, 1143, 1187, 1387, 1459, 1551, 1887, 2127, 2179, 2193, 2817, 3197, 3339, 3513, 3633, 4029, 4209, 4429, 4529, 4557 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`C1 = 'prevprime(n) followed by n'` `C2 = 'n followed by nextprime(n)'`
	EXAMPLE	`n=1551 -> previous prime is 1549, next prime is 1553, thus '15491551' and '15511553' are both primes.`
	CROSSREFS	`Cf. A034808-A034821.` `Sequence in context: A115366 A002462 A034814 this_sequence A140381 A055900 A054549` `Adjacent sequences: A034813 A034814 A034815 this_sequence A034817 A034818 A034819`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.`

page 1

Search completed in 0.002 seconds

Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

AT&T Labs Research