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!)
A062925 Numbers k that, when expressed in base 4 and then interpreted in base 9, give a multiple of k. 11

%I #24 Mar 13 2023 09:15:21

%S 0,1,2,3,5,10,15,25,75,100,125,355,435,500,1775,2415,3675,5825,9660,

%T 14700,17074,20786,22382,23300,27300,79716,83144,87087,97860,103930,

%U 125460,172105,331275,332576,348348,415720,1325100,1330304,1531980

%N Numbers k that, when expressed in base 4 and then interpreted in base 9, give a multiple of k.

%H Georg Fischer, <a href="/A062925/b062925.txt">Table of n, a(n) for n = 1..53</a> [First 45 terms from Harry J. Smith]

%e 5 in base 4 is 11, which interpreted in base 9 is 10 = 2*5.

%t Join[{0},Select[Range[1540000],Divisible[FromDigits[IntegerDigits[#,4],9],#]&]] (* _Harvey P. Dale_, Sep 03 2021 *)

%o (PARI) select(n->n==0 || fromdigits(digits(n,4), 9) % n == 0, [0..100000]) \\ _Andrew Howroyd_, Jun 28 2018

%Y Cf. A062845, A062846, A062847, A062848, A062849, A062850, A062853, A062864, A062865, A062884, A062889, A062891, A062920, A062921, A062922, A062923, A062928, A062929, A062930, A062931, A062934, A062937, A062939, A062942, A062943, A062944.

%K base,nonn

%O 1,3

%A _Erich Friedman_, Jul 21 2001

%E More terms from _Naohiro Nomoto_, Aug 06 2001

%E Offset changed to 1 by _Georg Fischer_, Mar 13 2023

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 July 9 11:57 EDT 2024. Contains 374174 sequences. (Running on oeis4.)