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@NogDogNov 08.2012 — #My guess is you're simply generating numbers too large for PHP to handle? 321^321 = 321 * 321 * 321 * 321...[317 more times!], and just 321^4 = 10,617,447,681.@NogDogNov 09.2012 — #It might simply be that you need to use bc*() functions for all arithmetic operations, not just the bcpow(). Otherwise you'll be exceeding the max PHP integer size (32 or 64 bit unsigned integer).
php wrong equation infinity result
the equation is
@N means N^N + N^(N+1) + N^(N+2) + … + N^(N+9)
Find the sum of digits in @321
so i made a little program that first calculate @N
[code=php]$n = 321;
$res = 0;
for($i=0;$i<10;$i++){
$res = $res + bcpow($n,$n+$i);
}
echo $res;
i get INF !!!
so why the result is infinity ?
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@NogDogNov 08.2012 — #My guess is you're simply generating numbers too large for PHP to handle? 321^321 = 321 * 321 * 321 * 321...[317 more times!], and just 321^4 = 10,617,447,681.0
@NogDogNov 09.2012 — #It might simply be that you need to use bc*() functions for all arithmetic operations, not just the bcpow(). Otherwise you'll be exceeding the max PHP integer size (32 or 64 bit unsigned integer).[code=php]
$n = 321;
$res = 0;
for($i=0;$i<10;$i++){
$res = bcadd($res, bcpow($n, bcadd($n, $i)));
}
echo $res;
[/code]