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A222307
Write down the nonprime numbers 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, ... and insert between two nonprimes the smallest prime not yet present in the sequence such that two neighboring integers sum to a nonprime.
3
1, 5, 4, 2, 6, 19, 8, 7, 9, 11, 10, 23, 12, 13, 14, 31, 15, 17, 16, 47, 18, 37, 20, 29, 21, 3, 22, 41, 24, 53, 25, 43, 26, 59, 27, 67, 28, 89, 30, 61, 32, 73, 33, 71, 34, 83, 35, 79, 36, 97, 38, 103, 39, 101, 40, 113, 42, 127, 44, 109, 45, 107, 46, 137, 48, 139, 49, 151, 50, 157, 51, 131, 52, 149
OFFSET
1,2
LINKS
Jean-Marc Falcoz, Primes and prime sums
J.-M. Falcoz, Primes and prime sums [Cached copy, with permission]
CROSSREFS
This is a kind of dual to A209259.
Sequence in context: A246746 A180131 A257972 * A368274 A175838 A347272
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 15 2013, based on a posting by Eric Angelini to the Sequence Fans Mailing List, Jan 14 2013. Terms computed by Jean-Marc Falcoz.
STATUS
approved