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!)
A204519 Square root of floor(A055851(n)/6). 4
0, 0, 0, 1, 2, 4, 11, 20, 40, 109, 198, 396, 1079, 1960, 3920, 10681, 19402, 38804, 105731, 192060, 384120, 1046629, 1901198, 3802396, 10360559, 18819920, 37639840, 102558961, 186298002 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
COMMENTS
Base-6 analog of A031150 [base 10], A204512 [base 8], A204517 (base 7), A204521 [base 5], A001353 [base 3], A001542 [base 2]. For bases 4 and 9, the corresponding sequence contains all integers.
LINKS
FORMULA
Conjecture (for n>=8): a(n) = 10*a(n-3) - a(n-6). - Vaclav Kotesovec, Nov 26 2012
Empirical g.f.: x^4*(x^3+4*x^2+2*x+1) / (x^6-10*x^3+1). - Colin Barker, Sep 15 2014
MATHEMATICA
Sqrt[Floor[Select[Range[100000], IntegerQ[Sqrt[Quotient[#^2, 6]]]&]^2/6]] (* Vaclav Kotesovec, Nov 26 2012 *)
PROG
(PARI) b=6; for(n=1, 2e9, issquare(n^2\b) & print1(sqrtint(n^2\b), ", "))
CROSSREFS
Sequence in context: A347007 A000638 A039824 * A076636 A011954 A278446
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Jan 15 2012
EXTENSIONS
More terms from Vaclav Kotesovec, Nov 26 2012
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 March 19 01:57 EDT 2024. Contains 370952 sequences. (Running on oeis4.)