A073033 A 4-cycle of the n => sigma(n)-n process, where sigma(n) is the sum of divisors of n (A000203).

18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964, 18656380, 20522060, 28630036, 24289964

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