Man pages matching name strtoul in section 3:

strtoul.3.en	debian 10 / manpages-dev
strtoul.3.es	debian 10 / manpages-es
strtoul.3.ja	debian 10 / manpages-ja-dev
strtoul.3.pt	debian 10 / manpages-pt-dev
strtoul.3.en	debian 11 / manpages-dev
strtoul.3.es	debian 11 / manpages-es-dev
strtoul.3.fr	debian 11 / manpages-fr-dev
strtoul.3.ja	debian 11 / manpages-ja-dev
strtoul.3.nl	debian 11 / manpages-nl-dev
strtoul.3.pt	debian 11 / manpages-pt-dev
strtoul.3.en	debian 12 / manpages-dev
strtoul.3.fr	debian 12 / manpages-fr-dev
strtoul.3.ja	debian 12 / manpages-ja-dev
strtoul.3.nl	debian 12 / manpages-nl-dev