A089339 Number of primes beginning with n and of the form n concatenated with p where p takes all the prime values less than n.

0, 0, 0, 1, 1, 0, 1, 1, 1, 2, 1, 1, 1, 0, 2, 3, 1, 1, 3, 2, 2, 3, 2, 3, 1, 2, 4, 2, 2, 4, 3, 2, 6, 2, 4, 5, 2, 2, 7, 2, 2, 6, 2, 3, 5, 4, 2, 4, 4, 3, 3, 3, 2, 8, 3, 5, 6, 3, 3, 7, 5, 4, 9, 2, 4, 5, 5, 4, 6, 3, 2, 9, 2, 4, 10, 2, 6, 8, 3, 4, 8, 7, 4, 8, 6, 5, 11, 7, 4, 8, 3, 2, 8, 9, 3, 10, 4, 7, 7, 4, 4, 11, 5

Offset

1,10

Comments

Conjecture: There are finitely many zeros in this sequence. What is the largest value of n such that a(n) = 0? Perhaps n = 14.

Links

Table of n, a(n) for n=1..103.

Example

a(10) = 2 and 103 and 107 are the associated primes.

Crossrefs

Cf. A089340.

Sequence in context: A200650 A281743 A118404 * A249303 A361167 A319081

Adjacent sequences: A089336 A089337 A089338 * A089340 A089341 A089342

Keyword

base,nonn

Author

Amarnath Murthy, Nov 04 2003

Extensions

Corrected and extended by Ray Chandler, Nov 07 2003

Status

approved