

A088651


a(n) = smallest number k such that rk1 is prime for all r = 1 to n.


7



3, 3, 4, 6, 6, 154770, 2894220, 2894220, 407874180, 214580145780, 9448481062020, 247236503934420, 2545206711847800, 18178612369988250180, 53792264108455702830
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OFFSET

1,1


COMMENTS

Is the sequence finite?


LINKS

Table of n, a(n) for n=1..15.
Carlos Rivera, Problems & Puzzles.


EXAMPLE

a(5)=6 because 1*61, 2*61, 3*61, 4*61, 5*61 are all prime.
a(11)=9448481062020 because all eleven numbers 1*94484810620201, 2*94484810620201,3*94484810620201,...,10*94484810620201 & 11*94484810620201 are prime and 9448481062020 is the smallest number with such property.


CROSSREFS

Cf. A088652, A125838, A125839, A088250, A101779.
Sequence in context: A145805 A277192 A098238 * A161019 A137901 A138095
Adjacent sequences: A088648 A088649 A088650 * A088652 A088653 A088654


KEYWORD

nonn


AUTHOR

Amarnath Murthy, Oct 29 2003


EXTENSIONS

Corrected and extended by Ray Chandler, Nov 01 2003
More terms from Don Reble, Nov 23 2003
Entry revised by N. J. A. Sloane, Jan 05 2007
a(14)a(15) from Jens Kruse Andersen, May 02 2008


STATUS

approved



