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!)
A324335 a(n) = A323363(A005940(1+n)), where A005940 is the Doudna sequence and A323363 is the Dirichlet inverse of Dedekind's psi. 6
1, -3, -4, 3, -6, 12, 4, -3, -8, 18, 24, -12, 6, -12, -4, 3, -12, 24, 32, -18, 48, -72, -24, 12, 8, -18, -24, 12, -6, 12, 4, -3, -14, 36, 48, -24, 72, -96, -32, 18, 96, -144, -192, 72, -48, 72, 24, -12, 12, -24, -32, 18, -48, 72, 24, -12, -8, 18, 24, -12, 6, -12, -4, 3, -18, 42, 56, -36, 84, -144, -48, 24, 112, -216, -288, 96, -72, 96, 32, -18 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(n) = A323363(A005940(1+n)).
PROG
(PARI)
A005940(n) = { my(p=2, t=1); n--; until(!n\=2, if((n%2), (t*=p), p=nextprime(p+1))); t }; \\ From A005940
A001615(n) = (n * sumdivmult(n, d, issquarefree(d)/d)); \\ From A001615
memoA323363 = Map();
A323363(n) = if(1==n, 1, my(v); if(mapisdefined(memoA323363, n, &v), v, v = -sumdiv(n, d, if(d<n, A001615(n/d)*A323363(d), 0)); mapput(memoA323363, n, v); (v)));
A324335(n) = A323363(A005940(1+n));
CROSSREFS
Sequence in context: A101684 A061800 A218789 * A238162 A367503 A048250
KEYWORD
sign
AUTHOR
Antti Karttunen, Feb 23 2019
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 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)