65 (number)

65
65 (sixty-five) is the natural number following 64 and preceding 66.wikipedia
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66 (number)

66Sixty Six
65 (sixty-five) is the natural number following 64 and preceding 66.
66 (sixty-six) is the natural number following 65 and preceding 67.

64 (number)

64sixty-four
65 (sixty-five) is the natural number following 64 and preceding 66.
64 (sixty-four) is the natural number following 63 and preceding 65.

Octagonal number

Octagonal
It is an octagonal number.
1, 8, 21, 40, 65, 96, 133, 176, 225, 280, 341, 408, 481, 560, 645, 736, 833, 936

Natural number

natural numberspositive integerpositive integers
65 (sixty-five) is the natural number following 64 and preceding 66.

Semiprime

biprimesemiprimessemiprime number
Sixty-five is the 23rd semiprime and the 3rd of the form (5.q).

Cullen number

Cullen primeCullen
It is also a Cullen number.

Mertens function

M''(12)
Given 65, the Mertens function returns 0.

0

zerozero function0 (number)
Given 65, the Mertens function returns 0.

Magic constant

magic sum
This number is the magic constant of 5 by 5 normal magic square: This number is also the magic constant of n-Queens Problem for n = 5.

Magic square

magic squaressimple magic squaresimple magic squares
This number is the magic constant of 5 by 5 normal magic square:

Eight queens puzzle

n''-queens problemn-Queens Problemn queens problem
This number is also the magic constant of n-Queens Problem for n = 5.

It appears in the Padovan sequence, preceded by the terms 28, 37, 49 (it is the sum of the first two of these).

Idoneal number

Euler's idoneal numbers
There are only 65 known Euler's idoneal numbers.

Pythagorean triple

Pythagorean triplesPythagorean triangleEuclid's formula
65 is the length of the hypotenuse of 4 different Pythagorean triangles, the lowest number to have more than 2: 65 2 = 16 2 + 63 2 = 33 2 + 56 2 = 39 2 + 52 2 = 25 2 + 60 2.

Atomic number

proton numberZatomic numbers
*The atomic number of terbium, a lanthanide

Terbium

TbTerbium (III)
*The atomic number of terbium, a lanthanide

Messier object

MessierMessier CatalogueList of Messier objects

Galaxy

galaxiesgalacticgalactic nuclei

Apparent magnitude

apparent visual magnitudemagnitudevisual magnitude

Constellation

constellationsEuropean constellationModern constellation

Leo (constellation)

LeoLeoneLeo constellation

Spiral galaxy

spiral galaxiesspiral armspiral

Cetus

Cetus (constellation)CetWhale