

A173914


Primes of the form R(n!1), where R is the digit reversal.


2




OFFSET

1,1


COMMENTS

The next term is too large to include.
Values of n are 3, 5, 19, 254, 266, ... [Charles R Greathouse IV, Feb 15 2011]


LINKS

Table of n, a(n) for n=1..3.


EXAMPLE

n=5 > 5!1 = 1201=119 > R(119)=911 that is prime


MAPLE

P:=proc(i) local a, b, k, n, v; v:=array(1..10000); for n from 1 by 1 to i do a:=1; k:=n!1; while k>0 do v[a]:=k(trunc(k/10)*10); k:=trunc(k/10); a:=a+1; od; k:=0; for b from a1 by 1 to 1 do k:=k+v[b]*10^(a1b); od; if isprime(k) then print(k); fi; od; end: P(2000);


CROSSREFS

Cf. A173913, A173915, A173916.
Sequence in context: A299726 A094630 A284637 * A015940 A093853 A195627
Adjacent sequences: A173911 A173912 A173913 * A173915 A173916 A173917


KEYWORD

nonn,bref,base


AUTHOR

Paolo P. Lava and Giorgio Balzarotti, Mar 02 2010


STATUS

approved



