Smallest square that begins with n: Difference between revisions
→{{header|Python}}: Added a functionally composed solution in Python.
(→{{header|Haskell}}: Added a Haskell version.) |
(→{{header|Python}}: Added a functionally composed solution in Python.) |
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Line 561:
10: 100 (10^2) 20: 2025 (45^2) 30: 3025 (55^2) 40: 400 (20^2)
</pre>
=={{header|Python}}==
<lang python>'''First square prefixed by digits of N'''
from itertools import count
# firstSquareWithPrefix :: Int -> Int
def firstSquareWithPrefix(n):
'''The first perfect square prefixed (in decimal)
by the decimal digits of N.
'''
pfx = str(n)
lng = len(pfx)
return int(
next(
s for s in (
str(x * x) for x in count(0)
)
if pfx == s[0:lng]
)
)
# ------------------------- TEST -------------------------
def main():
'''First matches for the range [1..49]'''
print('\n'.join([
str(firstSquareWithPrefix(x)) for x in range(1, 50)
]))
# MAIN ---
if __name__ == '__main__':
main()</lang>
{{Out}}
<pre>1
25
36
4
529
64
729
81
9
100
1156
121
1369
144
1521
16
1764
1849
196
2025
2116
225
2304
2401
25
2601
2704
289
2916
3025
3136
324
3364
3481
35344
36
3721
3844
3969
400
41209
4225
4356
441
45369
4624
4761
484
49</pre>
=={{header|Raku}}==
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