A124291 Largest prime < 10*a(n-1), a(1)=7.

7, 67, 661, 6607, 66067, 660661, 6606581, 66065773, 660657713, 6606577129, 66065771269, 660657712667, 6606577126663, 66065771266577, 660657712665739, 6606577126657373, 66065771266573693, 660657712665736927

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