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A092995 Smallest prime of the form concatenation of prime(n) with itself followed by a 9, or 0 if no such prime exists. 3
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 (list; graph; refs; listen; history; text; internal format)
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 * A040847 A040848 A040849

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

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Last modified October 15 17:24 EDT 2019. Contains 328037 sequences. (Running on oeis4.)