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A158191 Attach the smallest prime to the end of the string a(n-1) so a(n) is also prime 0
2, 23, 233, 2333, 23333, 2333323, 23333237, 233332373, 23333237353, 2333323735319, 2333323735319149, 2333323735319149571, 23333237353191495713, 23333237353191495713131, 233332373531914957131313 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

a(6)=2333323 since a(5)=23333 (prime) and 233333, 233335, 233337, 2333311, 2333313, 2333317 and 2333319 are all composite

CROSSREFS

Cf. A048549, A088603, A089703, A065712, A100893

Sequence in context: A127889 A088603 A048549 * A089703 A088094 A112782

Adjacent sequences:  A158188 A158189 A158190 * A158192 A158193 A158194

KEYWORD

nonn,base

AUTHOR

Sergio Pimentel, Mar 13 2009

EXTENSIONS

More terms from Sean A. Irvine, Nov 29 2009

STATUS

approved

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Last modified June 18 18:52 EDT 2019. Contains 324215 sequences. (Running on oeis4.)