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A124262
a(1) = 2; for n > 1, a(n) is largest prime < 10*a(n-1).
4
2, 19, 181, 1801, 17989, 179849, 1798487, 17984833, 179848309, 1798483067, 17984830667, 179848306667, 1798483066669, 17984830666651, 179848306666507, 1798483066665031, 17984830666650269, 179848306666502647
OFFSET
1,1
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..1000, extending and correcting a b-file from Artur Jasinski
MATHEMATICA
NestList[NextPrime[10 #, -1]&, 2, 20] (* Vincenzo Librandi, Jun 28 2014 *)
PROG
(PARI) step(k)=precprime(10*k)
t=1/5; vector(10, n, t=step(t)) \\ Charles R Greathouse IV, Sep 14 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 16 2006
STATUS
approved