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A124291 Largest prime < 10*a(n-1), a(1)=7. 1
7, 67, 661, 6607, 66067, 660661, 6606581, 66065773, 660657713, 6606577129, 66065771269, 660657712667, 6606577126663, 66065771266577, 660657712665739, 6606577126657373, 66065771266573693, 660657712665736927 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

MATHEMATICA

NestList[NextPrime[10 #, - 1]&, 7, 30] (* Vincenzo Librandi, Jun 28 2014 *)

CROSSREFS

Cf. A006902, A040016, A120031-A120041.

Sequence in context: A250165 A186655 A253175 * A067275 A073552 A036948

Adjacent sequences:  A124288 A124289 A124290 * A124292 A124293 A124294

KEYWORD

nonn

AUTHOR

Artur Jasinski, Dec 16 2006

STATUS

approved

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Last modified October 26 08:00 EDT 2021. Contains 348267 sequences. (Running on oeis4.)