login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A238989 Numbers that are not odiousfree*evilfree. The complement of A237417. 1
1, 2, 4, 7, 8, 11, 13, 14, 16, 19, 22, 25, 26, 28, 31, 32, 37, 38, 41, 44, 47, 49, 50, 52, 56, 59, 61, 62, 64, 67, 69, 73, 74, 75, 76, 77, 79, 81, 82, 87, 88, 91, 94, 97, 98, 100, 103, 104, 107, 109, 112, 115, 118, 121, 122, 124, 125, 127, 128 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

odFreeQ[n_] := AllTrue[Rest @ Divisors[n], EvenQ[DigitCount[#, 2, 1]] &]; evFreeQ[n_] := AllTrue[Divisors[n], OddQ[DigitCount[#, 2, 1]] &]; m = 100; o = Select[Range[2, m], odFreeQ]; e = Select[Range[m], evFreeQ]; Complement[Range[m], Union @ Select[Times @@@ Tuples[{o, e}], # <= m &]] (* Amiram Eldar, Oct 16 2020 *)

CROSSREFS

Cf. A000069 (odious numbers), A001969 (evil numbers), A093688 (1 together with odiousfree numbers), A093696 (evilfree numbers), A237417 (odiousfree*evilfree numbers).

Sequence in context: A080308 A089559 A165741 * A093696 A190851 A325427

Adjacent sequences:  A238986 A238987 A238988 * A238990 A238991 A238992

KEYWORD

nonn,base

AUTHOR

Irina Gerasimova, Mar 08 2014, following a suggestion from Juri-Stepan Gerasimov.

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 1 05:51 EDT 2021. Contains 346384 sequences. (Running on oeis4.)