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A075610 a(1) = 1, a(n) = smallest prime number not occurring earlier such that the concatenation a(n-1) and a(n) is a composite number. 3
1, 2, 5, 7, 11, 13, 3, 19, 17, 29, 23, 31, 41, 37, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 97, 89, 103, 101, 109, 107, 113, 127, 131, 137, 139, 149, 151, 167, 157, 173, 163, 179, 181, 191, 193, 197, 199, 223, 227, 211, 233, 229, 239, 241, 251, 269, 263, 271, 257, 277 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

CROSSREFS

Cf. A075607, A075608, A075609.

Sequence in context: A175034 A030498 A079933 * A057922 A243047 A113543

Adjacent sequences:  A075607 A075608 A075609 * A075611 A075612 A075613

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Sep 28 2002

EXTENSIONS

More terms from Michel ten Voorde Jun 23 2003

STATUS

approved

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Last modified January 23 10:50 EST 2020. Contains 331171 sequences. (Running on oeis4.)