login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A324349 a(n) = A324122(A005940(1+n)), where A005940 is the Doudna sequence and A324122(n) = sigma(n) - gcd(n*d(n), sigma(n)). 4
0, 2, 2, 6, 4, 0, 12, 14, 6, 16, 12, 24, 30, 36, 36, 30, 10, 16, 28, 36, 44, 48, 72, 48, 54, 90, 122, 90, 152, 96, 120, 60, 12, 32, 36, 0, 68, 48, 102, 80, 92, 128, 168, 144, 246, 216, 120, 120, 132, 168, 222, 216, 336, 360, 402, 192, 396, 464, 600, 272, 780, 360, 362, 126, 16, 40, 52, 72, 80, 96, 150, 112, 84, 208, 264, 112, 366, 288, 312, 184, 164, 272, 360, 0, 568 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Zeros occur in the same positions as in A324057, and can be obtained by sorting into ascending order the terms obtained with A156552(A001599(n)), n >= 1.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..16384

Antti Karttunen, Data supplement: n, a(n) computed for n = 0..65537

FORMULA

a(n) = A324122(A005940(1+n)).

a(n) = A324054(n) - A324058(n).

For n > 0, a(n) = A324189(A054429(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

A324122(n) = (sigma(n) - gcd(sigma(n), n*numdiv(n)));

A324349(n)  = A324122(A005940(1+n));

CROSSREFS

Cf. A005940, A054429, A324054, A324057, A324058, A324189

Cf. also A001599.

Sequence in context: A130728 A276085 A324122 * A092384 A061915 A138565

Adjacent sequences:  A324346 A324347 A324348 * A324350 A324351 A324352

KEYWORD

nonn

AUTHOR

Antti Karttunen, Feb 24 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 16:18 EDT 2019. Contains 322282 sequences. (Running on oeis4.)