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!)
A131801 Increment each prime factor for each term of the least prime sequence A087443. 2

%I

%S 1,3,9,15,27,45,105,81,135,225,315,1155,243,405,675,945,1575,3465,

%T 15015,729,1215,2025,3375,2835,4725,10395,11025,17325,45045,255255,

%U 2187,3645,6075,10125,8505,14175,23625,31185,33075,51975,121275,135135,225225

%N Increment each prime factor for each term of the least prime sequence A087443.

%F T(n,k) = A003961[A087443(n,k)]. - _R. J. Mathar_, Aug 01 2007

%e The term 30 = 2*3*5

%e becomes 105 = 3*5*7

%e A087443 begins

%e 1

%e 2

%e 4...6

%e 8...12...30

%e 16

%e etc

%e so a(n) begins

%e 1

%e 3

%e 9...15

%e 27..45..105

%e 81

%e etc

%Y Cf. A025487.

%Y Cf. A131822.

%K easy,tabf,nonn

%O 0,2

%A _Alford Arnold_, Jul 16 2007

%E More terms from _R. J. Mathar_, Aug 01 2007

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 June 20 00:16 EDT 2021. Contains 345154 sequences. (Running on oeis4.)