?? ?????????? ???????? ?????
131
??
???
????
?????
????
????
???
130
?????
132
.
[1]
[2]
[3]
?? ?????????
[
???
]
- 131 ?? ????? ?????? ????? 32, ? ???? ??? ???? ????? ????? ??? ?? 131 * 2 + 1 = 263 ? 263 ????.
- 131 ??? ???? ??? ????? ??? ??? ???? ??? ???????
![{\displaystyle B_{22}={\frac {854513}{138}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/96136006c3978fc5331c2d2fd410e91714ae08f0)
- 131
??? ????
, ?
??? ????
? ??? ????? ????? (equidigital number) ??? ??? ??? ????.
- 131 ???? ?53²-1
- 131 ??? ???? ???? ?? ???? ???? ??????? ???????? ? ??????? ???????? ??? ???????? ???? ?? ?? ????? ????? ??? ????
- 131
??? ???? ????
- 131 ??? ???? ?????? (?? ?????? 4x+3)
- 131 ??? ???? ???
- 131 ??? ???? ????? ??? p-2 ? p+2 ???? ??????
- 131 ???? ?? ???? ?? ???? ???? ?????? 25+25+81=9²+5²+5²=131
?????
[
???
]
|
---|
?? ??? ??????
| |
---|
By integer sequence
| |
---|
?? ??? ???????
| |
---|
???? (???????)
-dependent
| |
---|
?? ??? ?????
|
- ????? ?????? ???? (
p
,
p
+ 2
)
- Bi-twin chain (
n
? 1,
n
+ 1, 2
n
? 1, 2
n
+ 1, …
)
- Triplet (
p
,
p
+ 2 or
p
+ 4,
p
+ 6
)
- Quadruplet (
p
,
p
+ 2,
p
+ 6,
p
+ 8
)
- k
?Tuple
- Cousin (
p
,
p
+ 4
)
- Sexy (
p
,
p
+ 6
)
- ??? ???? ??????
- Sophie Germain (
p
, 2
p
+ 1
)
- Cunningham (
p
, 2
p
± 1, 4
p
± 3, 8
p
± 7, ...
)
- Safe (
p
, (
p
? 1)/2
)
- Arithmetic progression (
p
+
a·n
,
n
= 0, 1, 2, 3, ...
)
- Balanced (
consecutive
p
?
n
,
p
,
p
+
n
)
|
---|
?? ??? ??? ???????
| |
---|
??? ????
| |
---|
??? ??? ????
| |
---|
Related topics
| |
---|
??????? ??????? ?????? ??????
| |
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|