|
Search: id:A087969
|
|
|
| A087969 |
|
GCD[1+2^n, n^2] is not a square number. |
|
+0
1
|
|
| 9, 45, 50, 63, 81, 99, 117, 150, 153, 171, 207, 225, 261, 279, 315, 333, 350, 369, 387, 405, 423, 441, 450, 477, 495, 531, 549, 550, 567, 585, 603, 605, 639, 650, 657, 693, 711, 729, 747, 765, 801, 819, 850, 855, 873, 891, 909, 927, 950, 963, 981, 1014, 1017
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
Solutions x to Integer[Sqrt[GCD[1+2^x, x^2]]]=False.
|
|
EXAMPLE
|
n=9: GCD[513,81]=27=a(9) is not a square number.
|
|
MATHEMATICA
|
Do[s=Sqrt[GCD[n^2, 2^n+1]]; If[ !IntegerQ[s], Print[n]], {n, 1, 1000}]
|
|
CROSSREFS
|
Sequence in context: A037207 A096688 A124983 this_sequence A044111 A006886 A053816
Adjacent sequences: A087966 A087967 A087968 this_sequence A087970 A087971 A087972
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Labos E. (labos(AT)ana.sote.hu), Sep 22 2003
|
|
|
Search completed in 0.002 seconds
|
