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A196008 Positive integers a for which there is a (-5/3)-Pythagorean triple (a,b,c) satisfying a<=b. 7
3, 5, 6, 7, 8, 8, 9, 9, 10, 11, 12, 13, 14, 15, 15, 15, 16, 16, 17, 18, 18, 19, 20, 21, 21, 21, 22, 24, 24, 24, 25, 25, 26, 27, 27, 27, 27, 28, 30, 30, 30, 31, 32, 32, 32, 33, 33, 35, 35, 35, 35, 36, 36, 37, 38, 39, 39, 40, 40, 40, 40, 42, 42, 42, 43, 45, 45, 45, 45 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A195770 for definitions of k-Pythagorean triple, primitive k-Pythagorean triple, and lists of related sequences.

LINKS

Table of n, a(n) for n=1..69.

MATHEMATICA

z8 = 400; z9 = 150; z7 = 100;

k = -5/3; c[a_, b_] := Sqrt[a^2 + b^2 + k*a*b];

d[a_, b_] := If[IntegerQ[c[a, b]], {a, b, c[a, b]}, 0]

t[a_] := Table[d[a, b], {b, a, z8}]

u[n_] := Delete[t[n], Position[t[n], 0]]

Table[u[n], {n, 1, 15}]

t = Table[u[n], {n, 1, z8}];

Flatten[Position[t, {}]]

u = Flatten[Delete[t, Position[t, {}]]];

x[n_] := u[[3 n - 2]];

Table[x[n], {n, 1, z7}]   (* A196008 *)

y[n_] := u[[3 n - 1]];

Table[y[n], {n, 1, z7}]   (* A196009 *)

z[n_] := u[[3 n]];

Table[z[n], {n, 1, z7}]   (* A196083 *)

x1[n_] := If[GCD[x[n], y[n], z[n]] == 1, x[n], 0]

y1[n_] := If[GCD[x[n], y[n], z[n]] == 1, y[n], 0]

z1[n_] := If[GCD[x[n], y[n], z[n]] == 1, z[n], 0]

f = Table[x1[n], {n, 1, z9}];   (* A196084 *)

x2 = Delete[f, Position[f, 0]]

g = Table[y1[n], {n, 1, z9}];   (* A196085 *)

y2 = Delete[g, Position[g, 0]]

h = Table[z1[n], {n, 1, z9}];   (* A196086 *)

z2 = Delete[h, Position[h, 0]]

CROSSREFS

Cf. A195770, A196009, A196083, A186084.

Sequence in context: A316851 A196778 A195770 * A004220 A202308 A079058

Adjacent sequences:  A196005 A196006 A196007 * A196009 A196010 A196011

KEYWORD

nonn

AUTHOR

Clark Kimberling, Sep 27 2011

STATUS

approved

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Last modified October 31 05:06 EDT 2020. Contains 338098 sequences. (Running on oeis4.)