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!)
A364455 Record values of A365196. 1
2, 3, 4, 5, 6, 8, 18, 53, 94, 97, 98, 106, 132, 148, 150, 153, 155, 165, 204, 312 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = A365196(A365239(n)).
EXAMPLE
a(1) = 1 with A365196(0) = 2.
a(2) = 2 because A365196(1) = 3.
a(3) = 4 because A365196(9) = 4 is the first term of A365196 greater than 4.
MAPLE
f:= proc(k) local j;
for j from 0 do if not numtheory:-issqrfree(2^j+k) then return j fi
od;
end proc:
A:= 2: m:= 2: count:= 1:
for i from 1 by 2 while count < 19 do
if i mod 3 <> 0 and m >= 6 then next fi;
if i mod 5 <> 0 and m >= 20 then next fi;
v:= f(i);
if v > m then A:= A, v; m:= v; count:= count+1; fi;
od:
A;
MATHEMATICA
r = 0; Rest@ Reap[Do[k = 0; While[SquareFreeQ[2^k + i], k++]; If[k > r, Sow[r]; r = k], {i, 0, 2^16}] ][[-1, 1]] (* Michael De Vlieger, Aug 27 2023 *)
CROSSREFS
Sequence in context: A119336 A133706 A081710 * A358175 A241947 A128421
KEYWORD
nonn,more
AUTHOR
Robert Israel, Aug 27 2023
EXTENSIONS
a(20) from Michael S. Branicky, Aug 30 2023
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 May 26 18:12 EDT 2024. Contains 372840 sequences. (Running on oeis4.)