Let′s write following sequence:B = 1,4,6,8,9,10,...This numbers are sequence of non−prime numbers.And our sequence A = 1,2,6,12,20,29,x... has following rule:An−An−1=Bn−12−1 = 1 6−2 = 412−6=6 20−12=829−20=9So, x−29=10⇒ x=39Let's\;write\;following\;sequence:\\B\;=\;1,4,6,8,9,10,...\\This\;numbers\;are\;sequence\;of\;non-prime\;\\numbers.\\And\;our\;sequence\;A\;=\;1,2,6,12,20,29,x...\;\\has\;following\;rule:\\A_n-A_{n-1}=B_{n-1}\\2-1\;=\;1\;\;\;\;\;\;\;\;\;\;\;\;\;\;6-2\;=\;4\\12-6=6\;\;\;\;\;\;\;\;\;\;\;\;\;20-12=8\\29-20=9\\So,\;x-29=10\Rightarrow\;x=39Let′swritefollowingsequence:B=1,4,6,8,9,10,...Thisnumbersaresequenceofnon−primenumbers.AndoursequenceA=1,2,6,12,20,29,x...hasfollowingrule:An−An−1=Bn−12−1=16−2=412−6=620−12=829−20=9So,x−29=10⇒x=39
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