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!)
A045051 Numbers whose base-4 representation contains exactly two 0's and four 2's. 1
2090, 2186, 2210, 2216, 2570, 2594, 2600, 2690, 2696, 2720, 4266, 4650, 4746, 4770, 4776, 6186, 6282, 6306, 6312, 6666, 6690, 6696, 6786, 6792, 6816, 8298, 8346, 8358, 8361, 8363, 8366, 8378, 8426, 8490, 8586, 8610 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Enrique Pérez Herrero, Table of n, a(n) for n = 1..60000
MATHEMATICA
Select[Range[4^4, 4^7], {#4, #2} == {2, 4} & @@ DigitCount[#, 4] &] (* Michael De Vlieger, Dec 03 2017 *)
PROG
(Python)
import numpy as np
for a in range(10000):
x = np.base_repr(a, base=4)
if(x.count("0") == 2 and x.count("2") == 4):
print(a)
# Enrique Pérez Herrero, Dec 03 2017
CROSSREFS
Cf. A007090.
Sequence in context: A179124 A206606 A089159 * A102504 A270761 A332643
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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 21 14:19 EDT 2024. Contains 373547 sequences. (Running on oeis4.)