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A088640 Smallest number suffixed to concatenation of n times n gives a prime. 1
1, 3, 1, 9, 7, 29, 1, 3, 7, 39, 1, 23, 1, 97, 1, 91, 37, 59, 9, 93, 19, 97, 61, 293, 61, 3, 1, 57, 7, 43, 61, 7, 53, 31, 127, 353, 67, 841, 187, 9, 3, 179, 429, 127, 97, 3, 319, 11, 51, 39, 191, 33, 3, 41, 7, 39, 47, 73, 81, 401, 57, 441, 571, 957, 997, 1, 19, 291, 173, 9, 417 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..71.

EXAMPLE

a(6) = 29 and 66666629 is prime.

CROSSREFS

Cf. A088639.

Sequence in context: A019770 A136320 A201840 * A114195 A185948 A016601

Adjacent sequences:  A088637 A088638 A088639 * A088641 A088642 A088643

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Oct 27 2003

EXTENSIONS

More terms from Ray Chandler, Nov 01 2003

STATUS

approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)