A073032 A 4-cycle of the n => sigma(n)-n process, where sigma(n) is the sum of divisors of n (A000203).

18048976, 20100368, 18914992, 19252208, 18048976, 20100368, 18914992, 19252208, 18048976, 20100368, 18914992, 19252208, 18048976, 20100368, 18914992, 19252208, 18048976, 20100368, 18914992, 19252208, 18048976, 20100368, 18914992, 19252208, 18048976

Offset

1,1

Comments

18048976=2^4*11*102551 20100368=2^4*919*1367 18914992=2^4*37*89*359 19252208=2^4*1203263

Links

Table of n, a(n) for n=1..25.

Prog

(PARI) a(n)=[19252208, 18048976, 20100368, 18914992][n%4+1] \\ Charles R Greathouse IV, Feb 19 2013

Crossrefs

Cf. A000203, A045477, A073033.

Sequence in context: A282670 A238071 A271445 * A222977 A203884 A209959

Adjacent sequences: A073029 A073030 A073031 * A073033 A073034 A073035

Keyword

nonn,easy

Author

Miklos Kristof, Aug 22 2002

Extensions

Terms corrected by Charles R Greathouse IV, Feb 19 2013

Status

approved