A064392 Numbers in A064383 that are squarefree.

1, 2, 5, 10, 13, 26, 37, 65, 74, 130, 185, 370, 463, 481, 926, 962, 2315, 2405, 4630, 4810, 6019, 12038, 17131, 30095, 34262, 60190, 85655, 171310, 222703

Offset

1,2

Links

Table of n, a(n) for n=1..29.

Prog

(PARI) for(n=1, 10^6, x=sum(k=0, n, (-1)^k*k!); if(Mod(x, n)==0 && issquarefree(n), print(n)))

Crossrefs

Sequence in context: A103188 A281229 A185647 * A328700 A018296 A033316

Adjacent sequences: A064389 A064390 A064391 * A064393 A064394 A064395

Keyword

more,nonn

Author

Jason Earls, Sep 28 2001

Extensions

a(17)-a(29) from Donovan Johnson, Nov 30 2008

Status

approved