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A075338 a(1) = 1, a(2n) = smallest prime obtained by adding a composite number to a(2n-1). a(2n+1) = the smallest composite number obtained by adding a prime to a(2n). 1
1, 5, 8, 17, 20, 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, 309 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..57.

CROSSREFS

Sequence in context: A096545 A314567 A314568 * A088646 A090679 A031191

Adjacent sequences:  A075335 A075336 A075337 * A075339 A075340 A075341

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 October 16 05:38 EDT 2019. Contains 328044 sequences. (Running on oeis4.)