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A097043
a(n) = n - a(floor(sqrt(n))) for n > 1; a(1) = 1.
1
1, 1, 2, 3, 4, 5, 6, 7, 7, 8, 9, 10, 11, 12, 13, 13, 14, 15, 16, 17, 18, 19, 20, 21, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66
OFFSET
1,3
FORMULA
a(n)=n-sqrt(n)+O(n^(1/4)). - Benoit Cloitre, Jul 23 2009
PROG
(PARI) a(n)=if(n<2, 1, n-a(sqrtint(n))) \\ Benoit Cloitre, Jul 23 2009
CROSSREFS
Cf. A097044 ( n + a(floor(sqrt(n))) ).
Sequence in context: A194260 A227394 A209900 * A245336 A356964 A053759
KEYWORD
nonn,easy
AUTHOR
Rick L. Shepherd, Jul 20 2004
STATUS
approved