Search: id:A094486
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%I A094486
%S A094486 2,2472973457,6115597639891380737
%N A094486 Primes of form 2^j+223^j.
%C A094486 Expression 2^j+q^j below q=prime<=prime[130] provided always prime at 
               j=0; or for j=1 if q is a lesser-twin-prime; or more rarely 3 or 
               4 primes [four ones at q=3,5,17,37,59,137,179,223,461]; never found 
               5 or more relevant primes and the corresponding exponents proved 
               to be powers of 2. Formal proofs of observations wanted.
%e A094486 The relevant exponents are powers of 2: 0,4,8,128
%e A094486 a[4]=2^128+223^128 = a-prime-with-301-decimal-digits = 382844.....1067137.
%Y A094486 Cf. A082101, A094473-A094485.
%Y A094486 Sequence in context: A053823 A034251 A051241 this_sequence A109741 A105759 
               A154422
%Y A094486 Adjacent sequences: A094483 A094484 A094485 this_sequence A094487 A094488 
               A094489
%K A094486 nonn,bref
%O A094486 1,1
%A A094486 Labos E. (labos(AT)ana.sote.hu), Jun 01 2004
%E A094486 Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 15 2006

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