A063901 Numbers k such that Sum_{j=1..k} A001065(j) is divisible by k.

1, 6, 11, 17, 22, 36, 63, 94, 259, 632, 2161, 4441, 6268, 8305, 332790, 601702, 3864076, 3962954, 4393603, 11679862, 21878360, 57402883, 101658334, 121475393, 124070072, 432432118, 2068420025, 5287649972, 13320495021, 23871729838, 95486769082, 138630178659

Offset

1,2

Links

Table of n, a(n) for n=1..32.

Prog

(PARI) s(n)=sigma(n)-n; for(n=1, 10^8, x=sum(k=1, n, s(k)); if(Mod(x, n)==0, print(n)))
(PARI) x = 0; for(n=1, 10^10, x = x + sigma(n)-n; if(x%n == 0, print1(n, ", "))) \\ Ryan Propper, Jan 13 2008

Crossrefs

Cf. A001065.

Sequence in context: A315531 A315532 A315533 * A315534 A315535 A315536

Adjacent sequences: A063898 A063899 A063900 * A063902 A063903 A063904

Keyword

nonn

Author

Jason Earls, Aug 29 2001

Extensions

More terms from Michel ten Voorde Jun 20 2003

More terms from Ryan Propper, Jan 13 2008

a(28)-a(30) from Donovan Johnson, Dec 29 2008

a(31)-a(32) from Donovan Johnson, Aug 07 2011

Name clarified by Jon E. Schoenfield, Nov 17 2018

Status

approved