I offer this as a free SAAS. Nothing to install.<p><a href="https://iseven.dev/20" rel="nofollow">https://iseven.dev/20</a><p><a href="https://iseven.dev/21" rel="nofollow">https://iseven.dev/21</a><p>Also isodd as a service:<p><a href="https://isodd.dev/13" rel="nofollow">https://isodd.dev/13</a><p><a href="https://isodd.dev/16" rel="nofollow">https://isodd.dev/16</a>
This only provides support for 4.16e-09% of the 53-bit double integer range. Complete support by the method used would require at least 2,401,919,801,200 megabytes.