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##### string

:lisp (setf my-string...

:lisp my-string;

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##### string

string(+100921/476647...

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string(4.54);

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string(4.54);

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##### string

not sposition("=",str...

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##### string

a(n):=1/9*(10^n-1);

a50:a(50);

for d in divisors(a50...

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##### string

string(+2722952839/13...

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##### string

string("y''"+{a}*r+{b...

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##### string

string(+13/293932800*...

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##### string

int:4;

string:32;

int+string+string+int...

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### string

Run Example
```(%i1)a:[H[2]];
(%o1)                                [H ]
2
(%i2) sconcat(a,"pippo");
(%o2)                             [H[2]]pippo
(%i3) a*string(pippo);
(%o3)                             pippo [H ]
2
(%i4) string(pippo)*a;
(%o4)                             pippo [H ]
2
(%i5) ```
Run Example
```string(ratsimp((G8+(G9-G8)*(F16-F8)/(F9-F8))+((H8+(H9-H8)*(F16-F8)/(F9-F8))-(G8+(G9-G8)*(F16-F8)/(F9-F8)))*(H15-G7)/(H7-G7)));
(%o1) -(((F8-F16)*H15+(F16-F8)*G7)*H9+((F16-F9)*H15+(F9-F16)*G7)*H8+((F8-F16)*\
G9+(F16-F9)*G8)*H7+((F16-F8)*G9+(F9-F16)*G8)*H15)/((F9-F8)*H7+(F8-F9)*G7)
(%i2) ```
Run Example
```ggg(n):=f([a:eval_string("n"), x:charlist(string(n)),b:(sum(eval_string(part(x,k)),k,1,length(x)))])*(is(equal(primep(a)*primep(b),true^2))-unknown)/(true-unknown);
(%o1) ggg(n) := (f([a : eval_string("n"), x : charlist(string(n)),
b : sum(eval_string(part(x, k)), k, 1, length(x))])
2
(is(equal(primep(a) primep(b), true )) - unknown))/(true - unknown)
(%i2) sum(ggg(n),n,1,1000);
(%o2) f([991, [9, 9, 1], 19]) + f([977, [9, 7, 7], 23])
+ f([971, [9, 7, 1], 17]) + f([953, [9, 5, 3], 17]) + f([937, [9, 3, 7], 19])
+ f([919, [9, 1, 9], 19]) + f([911, [9, 1, 1], 11]) + f([887, [8, 8, 7], 23])
+ f([883, [8, 8, 3], 19]) + f([881, [8, 8, 1], 17]) + f([863, [8, 6, 3], 17])
+ f([829, [8, 2, 9], 19]) + f([827, [8, 2, 7], 17]) + f([823, [8, 2, 3], 13])
+ f([821, [8, 2, 1], 11]) + f([809, [8, 0, 9], 17]) + f([797, [7, 9, 7], 23])
+ f([773, [7, 7, 3], 17]) + f([757, [7, 5, 7], 19]) + f([751, [7, 5, 1], 13])
+ f([739, [7, 3, 9], 19]) + f([733, [7, 3, 3], 13]) + f([719, [7, 1, 9], 17])
+ f([683, [6, 8, 3], 17]) + f([661, [6, 6, 1], 13]) + f([647, [6, 4, 7], 17])
+ f([643, [6, 4, 3], 13]) + f([641, [6, 4, 1], 11]) + f([607, [6, 0, 7], 13])
+ f([601, [6, 0, 1], 7]) + f([599, [5, 9, 9], 23]) + f([593, [5, 9, 3], 17])
+ f([577, [5, 7, 7], 19]) + f([571, [5, 7, 1], 13]) + f([557, [5, 5, 7], 17])
+ f([487, [4, 8, 7], 19]) + f([467, [4, 6, 7], 17]) + f([463, [4, 6, 3], 13])
+ f([461, [4, 6, 1], 11]) + f([449, [4, 4, 9], 17]) + f([443, [4, 4, 3], 11])
+ f([421, [4, 2, 1], 7]) + f([409, [4, 0, 9], 13]) + f([401, [4, 0, 1], 5])
+ f([397, [3, 9, 7], 19]) + f([379, [3, 7, 9], 19]) + f([373, [3, 7, 3], 13])
+ f([359, [3, 5, 9], 17]) + f([353, [3, 5, 3], 11]) + f([337, [3, 3, 7], 13])
+ f([331, [3, 3, 1], 7]) + f([317, [3, 1, 7], 11]) + f([313, [3, 1, 3], 7])
+ f([311, [3, 1, 1], 5]) + f([283, [2, 8, 3], 13]) + f([281, [2, 8, 1], 11])
+ f([269, [2, 6, 9], 17]) + f([263, [2, 6, 3], 11]) + f([241, [2, 4, 1], 7])
+ f([229, [2, 2, 9], 13]) + f([227, [2, 2, 7], 11]) + f([223, [2, 2, 3], 7])
+ f([199, [1, 9, 9], 19]) + f([197, [1, 9, 7], 17]) + f([193, [1, 9, 3], 13])
+ f([191, [1, 9, 1], 11]) + f([179, [1, 7, 9], 17]) + f([173, [1, 7, 3], 11])
+ f([157, [1, 5, 7], 13]) + f([151, [1, 5, 1], 7]) + f([139, [1, 3, 9], 13])
+ f([137, [1, 3, 7], 11]) + f([131, [1, 3, 1], 5]) + f([113, [1, 1, 3], 5])
+ f([101, [1, 0, 1], 2]) + f([89, [8, 9], 17]) + f([83, [8, 3], 11])
+ f([67, [6, 7], 13]) + f([61, [6, 1], 7]) + f([47, [4, 7], 11])
+ f([43, [4, 3], 7]) + f([41, [4, 1], 5]) + f([29, [2, 9], 11])
+ f([23, [2, 3], 5]) + f([11, [1, 1], 2]) + f([7, [7], 7]) + f([5, [5], 5])
+ f([3, [3], 3]) + f([2, [2], 2])
(%i3) ```

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