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A171639
Sum of n-th nonprime number and n-th noncomposite number.
1
2, 6, 9, 13, 16, 21, 25, 31, 34, 39, 47, 51, 58, 63, 67, 72, 79, 86, 89, 97, 103, 106, 113, 118, 125, 135, 140, 143, 149, 153, 158, 173, 179, 186, 189, 200, 203, 211, 218, 223, 230, 237, 241, 253, 256, 261, 264, 277, 291, 296
OFFSET
1,1
COMMENTS
a(n) = A008578(n) + A018252(n).
FORMULA
a(n) = A064799(n-1) for n >= 2.
CROSSREFS
Sequence in context: A292659 A184869 A047276 * A054770 A184745 A113689
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Dec 13 2009
STATUS
approved