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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
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 (list; graph; refs; listen; history; text; internal format)
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 * A227758 A304638 A141903

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

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Last modified October 30 18:13 EDT 2020. Contains 338090 sequences. (Running on oeis4.)