A092995 Smallest prime of the form concatenation of prime(n) with itself followed by a 9, or 0 if no such prime exists.

29, 0, 59, 79, 11119, 139, 179, 199, 239, 29292929292929299, 31319, 379, 419, 439, 479, 0, 599, 619, 67679, 719, 739, 797979799, 839, 89899, 979797979, 1019, 1039, 1071071071079, 1091091091099, 1131139, 1279, 1319, 1371371371379, 1399, 1499

Offset

1,1

Comments

a(16)=0 since the concatenation of 53 with itself, followed by a 9, is always composite. a(36), if it exists, has more than 12000 digits. - Giovanni Resta, Apr 07 2006

Links

Table of n, a(n) for n=1..35.

Crossrefs

Cf. A092992, A092993, A092994.

Sequence in context: A123269 A067158 A243001 * A055785 A040847 A040848

Adjacent sequences: A092992 A092993 A092994 * A092996 A092997 A092998

Keyword

base,nonn

Author

Amarnath Murthy, Mar 28 2004

Extensions

More terms from Sam Alexander, Jan 09 2005

More terms from Giovanni Resta, Apr 07 2006

Status

approved