%I A088274
%S A088274 1,2,4,8,9,24,60,110,134,222,412,700,999,1383,5076,5543,6344,14600,
%T A088274 15093,21717,23636,30221,50711
%N A088274 Numbers n such that 10^n + 7 is prime.
%C A088274 No others less than 59500.
%H A088274 G. L. Honaker, Jr. and Chris Caldwell, eds., <a href="http://primes.utm.edu/
               curios/page.php/1000000007.html">Prime Curios!</a>
%H A088274 Makoto Kamada, <a href="http://homepage2.nifty.com/m_kamada/math/10007.htm">
               Factorizations of 100...007</a>.
%H A088274 Sabin Tabiraca and Kieran Reynolds, <a href="http://multimedia.ucc.ie/
               Staff/ST/articles/SNJ03_Tabirca1.ps">Lacunary Prime Numbers</a>.
%H A088274 <a href="Sindx_Pri.html#Pri_rep">Index entries for primes involving repunits</
               a>.
%e A088274 8 is a member since 10^8 + 7 = 100000007 is a prime.
%t A088274 Do[ If[ PrimeQ[ 10^n + 7], Print[n]], {n, 0, 10000}] (from Robert G. 
               Wilson v Dec 16 2004)
%Y A088274 Cf. A088275, A049054.
%Y A088274 Sequence in context: A111261 A046685 A140141 this_sequence A118418 A074810 
               A028984
%Y A088274 Adjacent sequences: A088271 A088272 A088273 this_sequence A088275 A088276 
               A088277
%K A088274 nonn
%O A088274 1,2
%A A088274 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 28 2003
%E A088274 a(7) - a(14) from Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 09 
               2003
%E A088274 a(15) - a(19) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005
%E A088274 Corrected and extended by Jason Earls (zevi_35711(AT)yahoo.com), Nov 
               27 2007 and Dec 07 2007. (14600 was missing and 23636 and 50711 is 
               new. These are presently only probable primes, found with WinPFGW.)
%E A088274 Missing term 30221 added by Herman Jamke (hermanjamke(AT)fastmail.fm), 
               Jan 02 2008