A086475 a(1) = 1 and then least squarefree number such that every partial concatenation of 2 or more terms is a prime.

1, 3, 7, 11, 13, 29, 37, 113, 123, 229, 287, 319, 443, 481, 533, 541, 557, 771, 777, 991, 1479, 1487, 1663, 2063, 2163, 2193, 2553, 2911, 3251, 3391, 3867, 3873, 3983, 4021, 4047, 4233, 4481, 4777, 4937, 4981, 6123, 6711, 7251

Offset

1,2

Links

Table of n, a(n) for n=1..43.

Example

13,137,13711 etc. are primes.

Crossrefs

Sequence in context: A173295 A191040 A074336 * A154832 A164568 A053728

Adjacent sequences: A086472 A086473 A086474 * A086476 A086477 A086478

Keyword

base,nonn

Author

Jason Earls and Amarnath Murthy, Jul 22 2003

Status

approved