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!)
A243200 Let A242720(n)-3 = prime(l)*prime(m), l<=m; a(n)=m-l. 0
0, 1, 1, 3, 1, 1, 1, 3, 4, 4, 3, 2, 2, 6, 6, 5, 1, 1, 5, 2, 2, 2, 10, 5, 5, 3, 3, 3, 2, 2, 2, 1, 1, 1, 3, 2, 2, 5, 1, 1, 3, 3, 3, 3, 6, 7, 4, 1, 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 3, 3, 3, 1, 1, 1, 2, 2, 2, 2, 2, 2, 8, 6, 6, 6, 1, 1, 1, 1, 1, 1, 7, 1, 1, 1, 4, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,4
COMMENTS
Since for a prime p>3, p^2 == 1 (mod 3), then for n>2, A242720(n) is not equal to p^2 + 3 (otherwise, lpf(A242720(n) - 1) = 3). So, the sequence has only zero term a(2).
LINKS
CROSSREFS
Sequence in context: A365334 A348660 A076476 * A016733 A060234 A131270
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Jun 01 2014
EXTENSIONS
More terms from Peter J. C. Moses, Jun 01 2014
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 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)