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A023691 Numbers with exactly 9 ones in binary expansion. 14
511, 767, 895, 959, 991, 1007, 1015, 1019, 1021, 1022, 1279, 1407, 1471, 1503, 1519, 1527, 1531, 1533, 1534, 1663, 1727, 1759, 1775, 1783, 1787, 1789, 1790, 1855, 1887, 1903, 1911, 1915, 1917, 1918, 1951, 1967, 1975 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000

FORMULA

a(n+1)=A057168(a(n)). - M. F. Hasler, Aug 27 2014

MATHEMATICA

Select[ Range[ 511, 2048 ], (Count[ IntegerDigits[ #, 2 ], 1 ]==9)& ]

PROG

(PARI) is_A023691(n)=hammingweight(n)==9 \\ M. F. Hasler, Aug 27 2014

(PARI) print1(t=2^9-1); for(i=2, 50, print1(", "t=A057168(t))) \\ M. F. Hasler, Aug 27 2014

CROSSREFS

Cf. A000079, A018900, A014311, A014312, A014313, A023688, A023689, A023690 (Hamming weight = 1, 2, ..., 8), A057168.

Sequence in context: A051985 A103206 A277172 * A045118 A043451 A158011

Adjacent sequences:  A023688 A023689 A023690 * A023692 A023693 A023694

KEYWORD

nonn,base,easy

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified June 27 16:18 EDT 2017. Contains 288790 sequences.