The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A230456 Odd evil a(n) (A001969), such that 3*a(n) and a(n)+3 are odious (A000069). 0

%I #12 Oct 22 2013 12:53:21

%S 23,29,39,71,95,119,125,135,159,263,287,343,349,359,373,383,407,413,

%T 423,437,469,479,503,509,519,543,599,605,615,629,639,663,669,679,711,

%U 741,791,797,807,839,869,917,933,1031,1055,1111,1117,1127,1141,1151,1175

%N Odd evil a(n) (A001969), such that 3*a(n) and a(n)+3 are odious (A000069).

%C Or a(n) is odd number such that the polynomial x^2 - (a(n)+3)*x + 3*a(n) has odious coefficients and evil roots.

%C 3*a(n) is in the A224072.

%t evilQ[n_]:=EvenQ[DigitCount[n,2][[1]]]; odiousQ[n_]:=OddQ[DigitCount[n,2][[1]]]; Select[Range[3000], OddQ[#] && evilQ[#] && odiousQ[3#] && odiousQ[#+3]&] (* _Peter J. C. Moses_, Oct 19 2013 *)

%Y Cf. A000069, A001969, A224072.

%K nonn,base

%O 1,1

%A _Vladimir Shevelev_, Oct 19 2013

%E More terms from _Peter J. C. Moses_, Oct 19 2013

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 5 22:26 EDT 2024. Contains 373110 sequences. (Running on oeis4.)