login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A341349 Numbers k for which A254049(k) is not a multiple of 3. 3
1, 3, 5, 6, 9, 11, 13, 15, 16, 20, 21, 23, 25, 28, 29, 30, 31, 35, 36, 37, 41, 43, 45, 46, 50, 51, 53, 54, 56, 57, 61, 63, 65, 67, 69, 71, 73, 75, 76, 77, 78, 79, 80, 81, 85, 90, 94, 95, 96, 98, 99, 100, 101, 103, 106, 113, 114, 116, 119, 120, 123, 124, 125, 130, 131, 135, 136, 138, 140, 141, 143, 145, 146, 147 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Numbers k for which A048673(2k-1) is of the form 3u+1.

Numbers k for which A292251(2k-1) is zero.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16369

Index entries for sequences computed from indices in prime factorization

PROG

(PARI)

A003961(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); }; \\ From A003961

A341346(n) = (((A003961(n+n-1)+1)/2)%3);

isA341349(n) = (1==A341346(n));

CROSSREFS

Positions of ones in A341346.

Cf. A003961, A048673, A254049, A292251, A341350 (complement).

Sequence in context: A324701 A047271 A047445 * A248638 A248881 A205534

Adjacent sequences:  A341346 A341347 A341348 * A341350 A341351 A341352

KEYWORD

nonn

AUTHOR

Antti Karttunen, Feb 10 2021

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 August 2 07:50 EDT 2021. Contains 346411 sequences. (Running on oeis4.)