Primes which contain only one odd digit: Difference between revisions
Primes which contain only one odd digit (view source)
Revision as of 15:14, 19 June 2023
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</pre>
=={{header|Ruby}}==
<syntaxhighlight lang="ruby">require 'prime'
def single_odd?(pr)
d = pr.digits
d.first.odd? && d[1..].all?(&:even?)
end
res = Prime.each(1000).select {|pr| single_odd?(pr)}
res.each_slice(10){|s| puts "%4d"*s.size % s}
n = 1_000_000
count = Prime.each(n).count{|pr| single_odd?(pr)}
puts "\nFound #{count} single-odd-digit primes upto #{n}."
</syntaxhighlight>
{{out}}
<pre> 3 5 7 23 29 41 43 47 61 67
83 89 223 227 229 241 263 269 281 283
401 409 421 443 449 461 463 467 487 601
607 641 643 647 661 683 809 821 823 827
829 863 881 883 887
Found 2560 single-odd-digit primes upto 1000000.
</pre>
=={{header|Sidef}}==
<syntaxhighlight lang="ruby">func primes_with_one_odd_digit(upto, base = 10) {
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