A124290 Largest prime < 10*a(n-1), a(1)=11.

11, 109, 1087, 10867, 108649, 1086469, 10864669, 108646667, 1086466657, 10864666531, 108646665307, 1086466653067, 10864666530661, 108646665306581, 1086466653065803, 10864666530658001, 108646665306579997, 1086466653065799961, 10864666530657999467, 108646665306579994669

Offset

1,1

Links

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

Mathematica

NestList[NextPrime[10#, -1]&, 11, 20]  (* Harvey P. Dale, Mar 09 2011 *)

Crossrefs

Cf. A124262.

Sequence in context: A048346 A054320 A287836 * A094703 A324355 A331537

Adjacent sequences: A124287 A124288 A124289 * A124291 A124292 A124293

Keyword

nonn

Author

Artur Jasinski, Dec 16 2006

Status

approved