A090479 Beginning with 1, least number such that filling the first n gaps with numbers from 1 to n yields primes in every case.

1, 3, 1, 9, 61, 1, 1, 31, 23, 39, 163, 29, 21, 47, 57, 13, 7, 221, 39, 73, 89, 63, 743, 451, 461, 111, 243, 73, 203, 31, 11, 417, 171, 147, 23, 191, 27, 37, 241, 1207, 1003, 143, 191, 243, 279, 247, 331, 233, 947, 107, 169, 673, 301, 2711, 977, 789, 111, 417, 221

Offset

1,2

Comments

Replacing the first n commas with numbers from 1 to n yields a prime for all n.

Links

Table of n, a(n) for n=1..59.

Example

113,11321,1132139,...are primes.

Crossrefs

Cf. A090480.

Sequence in context: A038202 A128415 A227795 * A355559 A227758 A304638

Adjacent sequences: A090476 A090477 A090478 * A090480 A090481 A090482

Keyword

base,nonn

Author

Amarnath Murthy, Dec 02 2003

Extensions

3 more terms from Ray G. Opao, Apr 07 2005

Many more terms from David Wasserman, Nov 17 2005

Status

approved