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!)
A174479 Triangle read by rows: R(n,k)= semiprime(n) mod A065516(k), where A065516 are differences between consecutive semiprimes. 2
0, 0, 0, 1, 0, 0, 0, 1, 0, 2, 0, 2, 0, 2, 0, 1, 0, 0, 3, 0, 3, 1, 0, 0, 1, 0, 3, 0, 0, 1, 0, 2, 0, 4, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 2, 0, 2, 0, 2, 0, 2, 0, 5, 1, 0, 0, 1, 0, 3, 0, 0, 0, 5, 0, 0, 1, 0, 2, 0, 4, 0, 1, 0, 6, 0, 0, 1, 2, 0, 3, 0, 5, 0, 2, 0, 0, 0, 0, 2 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

Table of n, a(n) for n=1..91.

EXAMPLE

The triangle starts in row n=1 with columns 1<=k<=n as:

0;

0, 0;

1, 0, 0;

0, 1, 0, 2;

0, 2, 0, 2, 0;

1, 0, 0, 3, 0, 3;

MAPLE

A001358 := proc(n) if n= 1 then 4; else for a from procname(n-1)+1 do if numtheory[bigomega](a) = 2 then return a; end if; end do; end if; end proc:

A065516 := proc(n) A001358(n+1)-A001358(n) ; end proc:

A174479 := proc(n, k) A001358(n) mod A065516(k) ; end proc:

CROSSREFS

Cf. A001358, A174433.

Sequence in context: A103271 A029832 A320535 * A134269 A172444 A277146

Adjacent sequences:  A174476 A174477 A174478 * A174480 A174481 A174482

KEYWORD

nonn,easy,tabl

AUTHOR

Juri-Stepan Gerasimov, Nov 28 2010

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 July 8 07:34 EDT 2020. Contains 335513 sequences. (Running on oeis4.)