%I A050244
%S A050244 3,6,7,8,10,11,12,14,16,22,32,34,38,82,83,106,128,149,218,223,334,412,
%T A050244 436,599,647,916,1373,4414,7246,8423,10118,10942
%N A050244 Numbers n such that 2^n + 3^n is a semiprime.
%e A050244 a(1)=3 because 2^3+3^3 = 5 * 7
%e A050244 a(2)=6 because 2^6+3^6 = 13 * 61
%e A050244 a(3)=7 because 2^7+3^7 = 5 * 463
%e A050244 a(4)=8 because 2^8+3^8 = 17 * 401
%e A050244 a(5)=10 because 2^10+3^10 = 13 * 4621
%e A050244 a(6)=11 because 2^11+3^11 = 5 * 35839
%e A050244 a(7)=12 because 2^12+3^12 = 97 * 5521
%e A050244 a(8)=14 because 2^14+3^14 = 13 * 369181
%e A050244 a(9)=16 because 2^16+3^16 = 3041 * 14177
%e A050244 a(10)=22 because 2^22+3^22 = 13 * 2414250301
%e A050244 a(11)=32 because 2^32+3^32 = 1153 * 1607133116929
%e A050244 a(12)=34 because 2^34+3^34 = 13 * 1282861452271981
%e A050244 a(13)=38 because 2^38+3^38 = 13 * 103911691734684541
%e A050244 a(14)=82 because 2^82+3^82 = 13 * 102329189594547549657540565413396038701
%e A050244 a(15)=83 because 2^83+3^83 = 5 * 798167678837469920188160718521149336927
%e A050244 a(16)=106 because 2^106+3^106 = 13 * 28900785585664327723593061693364968422740414514061
%e A050244 a(17)=128 because 2^128+3^128 = 257 * 45876204582640401445607833244277975113391731388650867226881
%e A050244 a(18)=149 because 2^149+3^149 = 5 * 24665899002341798194980052306171212216360861465143461865961807325057879
%Y A050244 Cf. A001358, A082101.
%Y A050244 Sequence in context: A113826 A053030 A051205 this_sequence A047283 A155932 
               A047557
%Y A050244 Adjacent sequences: A050241 A050242 A050243 this_sequence A050245 A050246 
               A050247
%K A050244 more,nonn
%O A050244 1,1
%A A050244 Hugo Pfoertner (hugo(AT)pfoertner.org), May 08 2003
%E A050244 Corrected and extended by Hugo Pfoertner (hugo(AT)pfoertner.org), May 
               12 2003
%E A050244 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 30 2007
%E A050244 5 more terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Nov 05 2009