# college

posted by .

what's the relation between these numbers 1,2,4,9,16,25,36,...

• Math -

Think "squares."

http://www.mathsisfun.com/square-root.html

• Maths -

The subject is maths.

These are positive integers n such that the sum of the divisors of n, excluding 1, is a multiple of the number of divisors of n.

so the next numbers in the sequence are

64, 81, 100, 121, 289,

As examples
The 9 divisors of 36 are {1,2,3,4,6,9,12,18,36}, giving sum (1+2+3=4+6+9+12+18+36)-1=90 which is a multiple of 9. Thus 36 is a term of the sequence.

The 3 divisors of 25 are
{1,5,25} giving a sum (1+5+25)-1=30 which is a multiple of 3. Thus 25 is a term of the sequence.

• college -

it's not square cuz i want the relation btw these numbers 1,2,4,9,16,25,36,.. NOT btw these numbers 1,4,9,16,25,...

• maths -

Agreed it is not squares. It is the sequence as I described above.

## Similar Questions

1. ### Physics - Power Law Data Analysis

In an experiment, two variable quantities, x and y were measured. The relation between x and y is thought to be: y= 4(pi)b(x)^3 x(cm) +/- 0.02cm 0.67 0.80 0.90 0.95 y(g) +/- 0.25g 2.25 4.00 5.52 6.60 a) Draw a complete table that allows …
2. ### Discrete Math

Consider the following relation on R1, the set of real numbers R1 = {(1,1), (1,2), (2,1), (2,2), (3,3), (4,4), (3,2), (2,3)} Determine whether or not each relation is flexible, symmetric, anti-symmetric, or transitive. * Reflexive …
3. ### Discrete Math

Which of these relations on {0, 1, 2, 3} are equivalence relations?
4. ### Math

The radius of a disk grows at 2cm/s. Calculate the growth rate of the disks area when the radius mesures 7 cm. (Designate the area of the disk with A and the radius with r) A) Find the relation between A and r B) Find the derivative …
5. ### Math

The radius of a disk grows at 2cm/s. Calculate the growth rate of the disks area when the radius mesures 7 cm. (Designate the area of the disk with A and the radius with r) A) Find the relation between A and r B) Find the derivative …
6. ### College Algebra

The relation is a function containing two ordered pairs. Reversing the components in each ordered pair results in a relation that is not a function. A) {(0, 2), (0, 3)} B) {(2, 3), (3, 2)} C) {(3, 1), (4, 1)} D) {(4, 5), (2, 3)}
7. ### College Algebra (Functions)

The relation is a function containing two ordered pairs. Reversing the components in each ordered pair results in a relation that is not a function. A) {(0, 2), (0, 3)} B) {(2, 3), (3, 2)} C) {(3, 1), (4, 1)} D) {(4, 5), (2, 3)}
8. ### Algebra

what is the domain of the relation {(1,4),(2,5),(3,6),(2,2),(1,1)}?
9. ### maths

The following statement defines a relation R in the natural numbers N. state whether or not each relation is symmetric 1. x is less than or equal to y 2. x+y =10
10. ### math

In a triangle ABC, E and F are the feets of the perpendiculars from B and C to AC and AB respectively. DE and CF meet at H. Let(HA) ⃗=x, (HB) ⃗=y, and (HC) ⃗=z. I. Find(AB) ⃗, (AC) ⃗ and (BC) ⃗ in terms of x, y and z. ii. …

More Similar Questions