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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A141813 Primitive RMS numbers: RMS numbers which are not the product of two smaller RMS numbers. 5
1, 7, 41, 239, 3055, 6665, 9545, 9855, 26095, 34697, 155287, 380511, 421655, 627215, 814463, 823537, 1166399, 1204281, 1256489, 1289441, 1815073, 2265353, 2544697, 2627343, 3132935, 3188809, 3762639, 4647985, 4730879, 4963127, 4995569, 5054015, 5143945 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

RMS numbers (see A140480) are numbers such that the RMS (Root Mean Square) of their divisors is an integer. If A and B both appear in A140480 and GCD(A,B)=1, then A*B is also in A140480. This sequence contains only those RMS numbers that are not a product of smaller RMS numbers.

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..666 (terms < 10^11)

EXAMPLE

The RMS Number 287 is not in the sequence because 287=7*41 and both 7 and 41 are RMS numbers.

CROSSREFS

Cf. A140480, A141812, A141814, A141815, A141816.

Sequence in context: A057009 A140480 A002315 * A088165 A287810 A292035

Adjacent sequences:  A141810 A141811 A141812 * A141814 A141815 A141816

KEYWORD

nonn

AUTHOR

Andrew Weimholt, Jul 07 2008

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 January 21 11:38 EST 2019. Contains 319354 sequences. (Running on oeis4.)