A160899 a(n) = the smallest positive multiple of n that has exactly a prime number of 1's in its binary representation.

3, 6, 3, 12, 5, 6, 7, 24, 9, 10, 11, 12, 13, 14, 285, 48, 17, 18, 19, 20, 21, 22, 69, 24, 25, 26, 81, 28, 87, 570, 31, 96, 33, 34, 35, 36, 37, 38, 117, 40, 41, 42, 129, 44, 405, 138, 47, 48, 49, 50, 357, 52, 265, 162, 55, 56, 171, 174, 59, 1140, 61, 62, 4221, 192, 65, 66, 67

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

spm[n_]:=Module[{k=1}, While[!PrimeQ[DigitCount[k*n, 2, 1]], k++]; k*n]; Array[ spm, 70] (* Harvey P. Dale, Apr 03 2022 *)

Crossrefs

Cf. A000120, A160900.

Sequence in context: A258758 A210201 A275535 * A360981 A336769 A337035

Adjacent sequences: A160896 A160897 A160898 * A160900 A160901 A160902

Keyword

base,nonn

Author

Leroy Quet, May 29 2009

Extensions

Extended by Ray Chandler, Jun 14 2009

Status

approved