id:A090559 - OEIS Search Results

Search: id:A090559

Displaying 1-1 of 1 results found.

page 1

Beginning with 2, least number such that concatenation of r copies of a(r), r = 1 to n is prime.

+0
2

2, 1, 3, 1, 9, 3, 273, 219, 7, 281, 11, 119, 1019, 111, 47, 69, 171, 161, 103, 477, 817, 129, 271, 73, 1867, 381, 507, 113, 2643, 487, 3037, 727, 1109, 1789, 5829, 4937, 767 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`2,211,211333,2113331111,211333111199999 are all prime.`
	CROSSREFS	`Cf. A090560.` `Sequence in context: A058036 A136179 A126761 this_sequence A098570 A122048 A046208` `Adjacent sequences: A090556 A090557 A090558 this_sequence A090560 A090561 A090562`
	KEYWORD	`base,more,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 10 2003`
	EXTENSIONS	`More terms from Max Alekseyev (maxale(AT)gmail.com), Sep 04 2009`

page 1

Search completed in 0.002 seconds

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research