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 A073033 A 4-cycle of the n => sigma(n)-n process, where sigma(n) is the sum of divisors of n (A000203). 1
 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 18656380=2^2*5*932819 20522060=2^2*5*13*17*4643 28630036=2^2*19*449*839 24289964=2^2*97*62603 LINKS Table of n, a(n) for n=1..24. PROG (PARI) a(n)=[24289964, 18656380, 20522060, 28630036][n%4+1] \\ Charles R Greathouse IV, Feb 19 2013 CROSSREFS Cf. A073032. Sequence in context: A209959 A140171 A185854 * A251389 A138025 A184790 Adjacent sequences: A073030 A073031 A073032 * A073034 A073035 A073036 KEYWORD nonn,easy AUTHOR Miklos Kristof, Aug 22 2002 STATUS approved

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Last modified April 13 09:16 EDT 2024. Contains 371640 sequences. (Running on oeis4.)