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%I #7 Apr 06 2016 12:47:52
%S 4,6,9,12,18,21,26,28,34,42,45,52,57,60,65,74,81,84,91,95,98,106,112,
%T 119,128,133,135,141,143,147,165,170,177,180,192,195,203,209,214,220,
%U 228,231,244,246,250,253,267,284,288,290,295,301,303,316,323,329,336
%N Nonprimes (A018252) with prime (A000040) subscripts.
%C a(n) = A018252(A000040(n)). Subsequence of A175250 (nonprimes (A018252) with noncomposite (A008578) subscripts), a(n) = A175250(n+1). a(n) U A102615(n) = A018252(n). [From _Jaroslav Krizek_, Mar 13 2010]
%e a(4) = nonprime(prime(4)) = nonprime(7) = 12.
%Y Let A = primes A000040, B = nonprimes A018252. The 2-level compounds are AA = A006450, AB = A007821, BA = A078782, BB = A102615. The 3-level compounds AAA, AAB, ..., BBB are A038580, A049078, A270792, A102617, A270794, A270796, A102216.
%K easy,nonn
%O 1,1
%A _Joseph L. Pe_, Jan 09 2003
%E Corrected by _Jaroslav Krizek_, Mar 13 2010
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