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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A088184 Numbers that can be written as sum of two coprime semiprimes. 2
13, 19, 23, 25, 29, 31, 34, 35, 37, 39, 41, 43, 44, 46, 47, 49, 51, 53, 55, 57, 58, 59, 61, 63, 64, 65, 67, 68, 69, 71, 73, 74, 75, 76, 77, 79, 81, 82, 83, 85, 86, 87, 88, 89, 91, 92, 93, 94, 95, 97, 98, 99, 100, 101, 102, 103, 104, 106, 107, 109, 111, 112, 113, 114 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A088183(a(n))>0; complement of A088185.

LINKS

Table of n, a(n) for n=1..64.

EXAMPLE

25 = 2*2+3*7, therefore 25 is a term;

2*2+2*11 is the only partition of n=26 into two semiprimes,

gcd(2*2,2*11)=2>1, therefore 26 is not a term.

CROSSREFS

Cf. A001358.

Sequence in context: A118845 A050717 A188540 * A274407 A054986 A210582

Adjacent sequences:  A088181 A088182 A088183 * A088185 A088186 A088187

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 22 2003

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 25 08:46 EST 2018. Contains 299647 sequences. (Running on oeis4.)