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A075339 a(1) = 1, a(2n) = smallest composite number obtained by adding a prime to a(2n-1). a(2n+1) = the smallest prime obtained by adding a composite number to a(2n). 0
1, 4, 13, 15, 19, 21, 29, 32, 41, 44, 53, 55, 59, 62, 71, 74, 83, 85, 89, 91, 97, 99, 103, 105, 109, 111, 127, 129, 137, 140, 149, 152, 167, 169, 173, 175, 179, 182, 191, 194, 227, 230, 239, 242, 251, 253, 257, 259, 263, 265, 269, 272, 281, 284, 293, 295, 307 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(k) = b(k-1) for k > 6 where b(r) is the r-th term of A075338.
LINKS
CROSSREFS
Cf. A075338.
Sequence in context: A066825 A014563 A066774 * A089733 A126908 A106681
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Sep 18 2002
EXTENSIONS
More terms from David Wasserman, Jan 16 2005
STATUS
approved

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Last modified March 29 09:32 EDT 2024. Contains 371268 sequences. (Running on oeis4.)