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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
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
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.)