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A168132
Numbers m = sum_(k=1...n) sigma(k) / k such that sum_(k=1...n) sigma(k) / k is integer for any k.
2
1, 2, 7, 9, 14, 52, 149, 213, 673, 1778, 3653, 6831, 9868, 570972, 2835107, 3613594, 47211979, 60418265, 99909506, 1701207282, 4587170542, 10955668024, 29031152874, 114018751785, 813149731047
OFFSET
1,2
COMMENTS
Numbers m = A024916(k) / k such that A024916(k) / k is integer for any k. If a(14) exist must be bigger than 82000.
Corresponding values of k, and sum_(k=1...n) sigma(k) are given in A056550 and A168133. [From Jaroslav Krizek, Nov 21 2009]
EXAMPLE
Number a(3) = 7 is in sequence because A024916(8) / 8 = 56 / 8 = 7 is integer for k = 8.
CROSSREFS
Sequence in context: A341631 A102994 A226824 * A211280 A294863 A085544
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Nov 18 2009, Dec 04 2009
EXTENSIONS
a(14)-a(25) from Donovan Johnson, Jun 16 2011
STATUS
approved