Search: id:A053409
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%I A053409
%S A053409 21,34,55,377,4181,17711,121393,1346269,5702887,165580141,53316291173,
%T A053409 956722026041,2504730781961,308061521170129,806515533049393,
%U A053409 14472334024676221,1779979416004714189,19740274219868223167
%N A053409 Fibonacci numbers which are semiprimes.
%e A053409 a(1)=21 because 21 is the product of two primes.
%Y A053409 Cf. A000045, A000040, A001358.
%Y A053409 Cf. A072381.
%Y A053409 Sequence in context: A135595 A082483 A075735 this_sequence A144205 A008946 
               A095738
%Y A053409 Adjacent sequences: A053406 A053407 A053408 this_sequence A053410 A053411 
               A053412
%K A053409 nonn
%O A053409 1,1
%A A053409 G. L. Honaker, Jr. (honak3r(AT)gmail.com), Jan 09 2000

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