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A086563 Smallest number of the form 10^k +1 with n distinct prime divisors. 1
2, 10001, 1001, 100000000001, 1000000001, 1000000000000000000000000000000000001, 1000000000000001, 1000000000000000000000000000000001, 1000000000000000000000000000000000000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

a(5) = 1000000001= 7*11*13*19*52579 has five prime divisors.

MATHEMATICA

With[{c=10^Range[0, 40]+1}, Flatten[Table[Select[c, PrimeNu[#]==n&, 1], {n, 10}]]] (* Harvey P. Dale, Aug 12 2012 *)

CROSSREFS

Cf. A085564.

Sequence in context: A285692 A340546 A343700 * A023328 A294324 A349510

Adjacent sequences:  A086560 A086561 A086562 * A086564 A086565 A086566

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Aug 31 2003

EXTENSIONS

More terms from Sascha Kurz, Sep 22 2003

STATUS

approved

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Last modified January 28 23:12 EST 2022. Contains 350670 sequences. (Running on oeis4.)