A057533 Values of n for which iteration of Chowla's function loops.

48, 75, 92, 140, 146, 176, 195, 215, 255, 267, 287, 312, 332, 369, 386, 407, 411, 519, 527, 551, 627, 734, 744, 818, 972, 973, 984, 1027, 1050, 1078, 1096, 1149, 1175, 1185, 1387, 1408, 1472, 1474, 1535, 1575, 1648, 1651, 1784, 1792, 1880, 1888, 1891

Offset

1,1

Comments

Chowla's function (A048050) = sum of divisors of n except 1 and n.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Prog

(Haskell)
a057533 n = a057533_list !! (n-1)
a057533_list = filter (\z -> p z [z]) [1..] where
   p x ts = y > 0 && (y `elem` ts || p y (y:ts)) where y = a048050 x
-- Reinhard Zumkeller, Feb 09 2013

Crossrefs

Cf. A048050.

Cf. A005276 (subsequence). - Reinhard Zumkeller, Feb 09 2013

Sequence in context: A334899 A165039 A211721 * A005276 A328370 A143722

Adjacent sequences: A057530 A057531 A057532 * A057534 A057535 A057536

Keyword

nonn

Author

Asher Auel, Sep 03 2000

Status

approved