A141813 - OEIS

A141813

Primitive RMS numbers: RMS numbers which are not the product of two smaller RMS numbers.

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

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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

Giovanni Resta, Table of n, a(n) for n = 1..2768 (terms < 10^13, first 666 terms from Donovan Johnson)

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: A140480 A327055 A002315 * A088165 A287810 A292035

Adjacent sequences: A141810 A141811 A141812 * A141814 A141815 A141816

KEYWORD

nonn

AUTHOR

Andrew Weimholt, Jul 07 2008

STATUS

approved