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!)
A046331 Palindromes with exactly 5 prime factors (counted with multiplicity). 4

%I #10 Oct 10 2019 22:54:33

%S 252,272,464,616,656,696,828,848,888,2552,4004,4554,4664,4884,5445,

%T 5775,6006,6996,8118,8228,8778,8888,9009,18081,18981,20202,20502,

%U 21012,21812,22022,23432,23532,24642,25552,25652,26862,27272,27672,28182

%N Palindromes with exactly 5 prime factors (counted with multiplicity).

%H Harvey P. Dale, <a href="/A046331/b046331.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[30000],#==IntegerReverse[#]&&PrimeOmega[#]==5&] (* The program uses the IntegerReverse function from Mathematica version 10 *) (* _Harvey P. Dale_, Jul 16 2016 *)

%Y Cf. A014614, A046318.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Jun 15 1998

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 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)