|
|
A030064
|
|
1 + product of any two terms is a square.
|
|
0
|
|
|
|
OFFSET
|
1,2
|
|
REFERENCES
|
Martin Gardner, probably "Mathematical Magic Show".
|
|
LINKS
|
|
|
EXAMPLE
|
0*2,4,12,420 + 1 = 1
2*4 + 1 = 9
2*12 + 1 = 25
2*420 + 1 = 841 -> sqrt = 29
4*12 + 1 = 49
4*420 + 1 = 1681 -> sqrt = 41
12*420 + 1 = 5041 -> sqrt = 71
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,fini,full
|
|
AUTHOR
|
Timothy Chow (tchow(AT)math.lsa.umich.edu)
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|