document.write( "Question 97099: what comes next in the sequence.
\n" ); document.write( "1,3,7,13 \n" ); document.write( "

Algebra.Com's Answer #70659 by checkley71(8403) $\"\"$ $\"About$

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1,3,7,13,21
\n" ); document.write( "RULE:
\n" ); document.write( "1+(2)=3
\n" ); document.write( "3+(4)=7
\n" ); document.write( "7+(6)=13
\n" ); document.write( "13+(8)=21 \n" ); document.write( "

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