Extended maintenance of Ruby 1.9.3 ended on February 23, 2015. Read more

- prime.rb

Internal use. An implementation of eratosthenesâ€™s sieve

next_to(n)
click to toggle source

returns the least odd prime number which is greater than `n`

.

# File prime.rb, line 441 def next_to(n) n = (n-1).div(2)*2+3 # the next odd number to given n table_index, integer_index, bit_index = indices(n) loop do extend_table until @tables.length > table_index for j in integer_index...ENTRIES_PER_TABLE if !@tables[table_index][j].zero? for k in bit_index...BITS_PER_ENTRY return NUMS_PER_TABLE*table_index + NUMS_PER_ENTRY*j + 2*k+1 if !@tables[table_index][j][k].zero? end end bit_index = 0 end table_index += 1; integer_index = 0 end end

Commenting is here to help enhance the documentation. For example, code samples, or clarification of the documentation.

If you have questions about Ruby or the documentation, please post to one of the Ruby mailing lists. You will get better, faster, help that way.

If you wish to post a correction of the docs, please do so, but also file bug report so that it can be corrected for the next release. Thank you.

If you want to help improve the Ruby documentation, please visit Documenting-ruby.org.