login
A196614
Decimal expansion of the least x>0 satisfying 4*sec(x)=x.
5
5, 5, 2, 2, 4, 3, 4, 1, 0, 2, 5, 9, 1, 0, 2, 6, 9, 1, 6, 5, 1, 2, 7, 9, 3, 4, 7, 7, 1, 8, 0, 2, 2, 6, 4, 6, 1, 8, 3, 5, 3, 4, 4, 1, 0, 2, 2, 5, 1, 4, 9, 7, 9, 9, 3, 3, 7, 2, 2, 7, 1, 2, 5, 1, 6, 3, 5, 2, 4, 7, 7, 6, 4, 8, 3, 6, 4, 6, 0, 7, 0, 4, 5, 2, 7, 3, 5, 1, 7, 5, 4, 1, 6, 2, 1, 1, 0, 1, 9, 4
OFFSET
1,1
EXAMPLE
x=5.5224341025910269165127934771802264618...
MATHEMATICA
Plot[{1/x, 2/x, 3/x, 4/x, Cos[x]}, {x, 0, 2 Pi}]
t = x /. FindRoot[1/x == Cos[x], {x, 4, 7}, WorkingPrecision -> 100]
RealDigits[t] (* A133868 *)
t = x /. FindRoot[2/x == Cos[x], {x, 4, 7}, WorkingPrecision -> 100]
RealDigits[t] (* A196612 *)
t = x /. FindRoot[3/x == Cos[x], {x, 4, 7}, WorkingPrecision -> 100]
RealDigits[t] (* A196613 *)
t = x /. FindRoot[4/x == Cos[x], {x, 4, 7}, WorkingPrecision -> 100]
RealDigits[t] (* A196614 *)
t = x /. FindRoot[5/x == Cos[x], {x, 4, 7}, WorkingPrecision -> 100]
RealDigits[t] (* A196615 *)
t = x /. FindRoot[6/x == Cos[x], {x, 4, 7}, WorkingPrecision -> 100]
RealDigits[t] (* A196616 *)
CROSSREFS
Sequence in context: A229160 A011501 A319305 * A319905 A319593 A335321
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Oct 05 2011
STATUS
approved