Brilliant numbers: Difference between revisions
Add Factor
(Add Factor) |
|||
Line 278:
Elapsed time: 0.167788 seconds
</pre>
=={{header|Factor}}==
{{works with|Factor|0.99 2022-04-03}}
<lang factor>USING: assocs formatting grouping io kernel lists lists.lazy
math math.functions math.primes.factors prettyprint
project-euler.common sequences ;
MEMO: brilliant? ( n -- ? )
factors [ length 2 = ] keep
[ number-length ] map all-eq? and ;
: lbrilliant ( -- list )
2 lfrom [ brilliant? ] lfilter 1 lfrom lzip ;
: first> ( m -- n )
lbrilliant swap '[ first _ >= ] lfilter car ;
: .first> ( n -- )
dup first> first2
"First brilliant number >= %7d: %7d at position %5d\n"
printf ;
100 lbrilliant ltake list>array keys 10 group simple-table. nl
{ 1 2 3 4 5 6 } [ 10^ .first> ] each</lang>
{{out}}
<pre>
4 6 9 10 14 15 21 25 35 49
121 143 169 187 209 221 247 253 289 299
319 323 341 361 377 391 403 407 437 451
473 481 493 517 527 529 533 551 559 583
589 611 629 649 667 671 689 697 703 713
731 737 767 779 781 793 799 803 817 841
851 869 871 893 899 901 913 923 943 949
961 979 989 1003 1007 1027 1037 1067 1073 1079
1081 1121 1139 1147 1157 1159 1189 1207 1219 1241
1247 1261 1271 1273 1333 1343 1349 1357 1363 1369
First brilliant number >= 10: 10 at position 4
First brilliant number >= 100: 121 at position 11
First brilliant number >= 1000: 1003 at position 74
First brilliant number >= 10000: 10201 at position 242
First brilliant number >= 100000: 100013 at position 2505
First brilliant number >= 1000000: 1018081 at position 10538
</pre>
| |||