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A152609
a(1) = 1; thereafter a(n) is always the smallest integer > a(n-1) not leading to a contradiction, such that the concatenation of any four consecutive digits in the sequence is a prime.
9
1, 2, 3, 7, 19, 31, 91, 373, 931, 1931, 1933, 7193, 11931, 19311, 93119, 311931, 913733, 1373313, 7331373, 9311931, 19311931, 19311933, 71931193, 119311931, 193119311, 931193119, 3119311931, 9137331373, 9311931193
OFFSET
1,2
COMMENTS
Computed by Jean-Marc Falcoz.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Sep 23 2009
STATUS
approved