A075609 a(1) = 1, a(n) = smallest prime number not occurring earlier such that the concatenation a(n-1) and a(n) is a prime.

1, 3, 7, 19, 13, 61, 31, 37, 67, 79, 103, 43, 73, 127, 139, 97, 151, 157, 109, 199, 181, 193, 163, 211, 229, 223, 241, 271, 277, 331, 283, 397, 337, 313, 307, 367, 457, 421, 349, 373, 379, 433, 439, 409, 463, 523, 487, 601, 541, 547, 499, 571, 673, 613, 577

Offset

1,2

Links

Table of n, a(n) for n=1..55.

Crossrefs

Cf. A075607, A075608, A075610.

Sequence in context: A212848 A217371 A088629 * A083439 A151858 A365139

Adjacent sequences: A075606 A075607 A075608 * A075610 A075611 A075612

Keyword

base,nonn

Author

Amarnath Murthy, Sep 28 2002

Extensions

More terms from Michel ten Voorde Jun 23 2003

Status

approved