id:A084670 - OEIS Search Results

Search: id:A084670

Displaying 1-1 of 1 results found.

page 1

Numbers n such that concatenation of prime[n] and n is prime.

+0
1

3, 9, 19, 21, 37, 63, 77, 81, 87, 107, 121, 133, 177, 201, 211, 213, 217, 281, 293, 303, 321, 327, 329, 333, 351, 391, 393, 439, 481, 503, 507, 519, 543, 547, 551, 561, 579, 581, 599, 621, 639, 657, 663, 667 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`9 is a term because prime[9]=23 and concatenation of 23 and 9 is prime`
	CROSSREFS	`Sequence in context: A067864 A097267 A043097 this_sequence A002091 A056259 A056682` `Adjacent sequences: A084667 A084668 A084669 this_sequence A084671 A084672 A084673`
	KEYWORD	`nonn,base`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Jun 29 2003`

page 1

Search completed in 0.002 seconds

Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research