id:A034814 - OEIS Search Results

Search: id:A034814

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, 87, 111, 123, 153, 177, 207, 211, 239, 263, 273, 289, 327, 333, 343, 359, 407, 471, 489, 497, 513, 541, 597, 621, 651, 659, 663, 681, 687, 693, 697, 747, 753, 793, 819, 831, 869, 909, 977, 987, 1027, 1041, 1089, 1131, 1143, 1239, 1491, 1611 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`C1 = 'prevprime(n) followed by n'` `C2 = 'n followed by prevprime(n)'`
	EXAMPLE	`n=747 -> previous prime is 743, thus '743747' and '747743' are both primes.`
	CROSSREFS	`Cf. A034808-A034821.` `Sequence in context: A007681 A115366 A002462 this_sequence A034816 A140381 A055900` `Adjacent sequences: A034811 A034812 A034813 this_sequence A034815 A034816 A034817`
	KEYWORD	`nonn,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1998.`

page 1

Search completed in 0.002 seconds

Last modified December 4 14:15 EST 2008. Contains 151279 sequences.

AT&T Labs Research