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A118717
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Sum of two consecutive semiprimes.
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8
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10, 15, 19, 24, 29, 36, 43, 47, 51, 59, 67, 69, 73, 77, 85, 95, 100, 106, 112, 115, 120, 127, 134, 143, 151, 159, 167, 171, 173, 178, 184, 187, 189, 201, 217, 226, 233, 237, 240, 243, 245, 252, 262, 267, 275, 283, 285, 288, 291, 301, 313, 317, 320, 327, 335
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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Total /@ Partition[Select[Range[50000], 2 == PrimeOmega[#] &], 2, 1] (* Zak Seidov, Jan 31 2017 *)
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PROG
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(PARI) isA001358(n)= { local(f, fct, sumpo); if(n <4, return(0) ); f=factor(n); fct=(matsize(f))[1]; sumpo= sum(i=1, fct, f[i, 2]); if ( sumpo != 2, return(0), return(1) ); }
{ oldn=0; for(n=4, 200, if( isA001358(n)==1, if( oldn !=0, print1(oldn+n, ", "); ); oldn=n; ); ); } \\ R. J. Mathar, May 23 2006
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Luc Stevens (lms022(AT)yahoo.com), May 21 2006
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EXTENSIONS
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STATUS
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approved
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