|
Search: id:A105174
|
|
|
| A105174 |
|
Numbers n such that n*(n+1)/4 - 1 and n*(n+1)/4 + 1 are twin primes. |
|
+0
1
|
|
| 8, 15, 23, 24, 71, 80, 104, 128, 159, 216, 231, 264, 288, 303, 336, 344, 455, 495, 528, 543, 560, 608, 624, 680
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
The twin primes are = (sum of numbers from 1 to n)/2 -1 and +1
|
|
EXAMPLE
|
8*9/4=18, 17 and 19 twin primes so a(1)=8
15*16/4=60, 59 and 61 twin primes so a(2)=15
|
|
CROSSREFS
|
Sequence in context: A079043 A024734 A024956 this_sequence A126622 A109332 A015727
Adjacent sequences: A105171 A105172 A105173 this_sequence A105175 A105176 A105177
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Pierre CAMI (pierrecami(AT)tele2.fr), Apr 11 2005
|
|
|
Search completed in 0.002 seconds
|
