اول بودن این عدد را میتوانید بصورت احتمالی در این سایت امتحان کنید.
139800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000050000055000005000005500005500000500000550000050000000000000000000000000050055055055005005005005505505500500550550550550050050000000000000000000000050055055055055005005005505505500500550550550550550050000000000000000000000050055055055055055005505505505500500550550550550550055000000000000000000000050055055055055055005505505505505500550550550550550055000000000000000000000550055055055055055005505505505505500550550550550550055000000000000000000000550055055055055055005505505505505500550550550550550055000000000000000000000550055055055055055005505505505505500550550550550550055000000000000000000000555055055055055055005505505505505500550550550550550055000000000000000000000555055055055055055005505505505505500550550550550550055000000000000000000000555055055055000000000005505505500000000000550550550055000000000000000000000555055055050005555555500005500005555555500050550550055000000000000000000000555055055000555555555555500005555555555555000550550555000000000000000000000050055055005555500055555555055555550005555500550050050000000000000000000000000000000005555500000005555555500000005555500000000000000000000000000000000555555555555555555555555555555555555555555555555555555000000000000000000000555555555555555555555555555555555555555555555555555555000000000000000000000000000000000000055555555000000555555550000000000000000000000000000000000000555055055055000555555500005500000555555000550550550555000000000000000000000555055055055005555500005505505500005555500550550550555000000000000000000000555055055055000050005505505505505500050000550550550055000000000000000000000555055055055055005005505505505505550500550550550550055000000000000000000000555055055055055055505505505505505500550550550550550055000000000000000000000555055055055055055505505505505505500550550550550550055000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005555555555555555555555555555555555555555555555555555555555555500000000000005555555555555555555555555555555555555555555555555555555555555500000000000000555555555555555555555555555555555555555555555555555555555555000000000000000055555555555555555555555555555555555555555555555555555555550000000000000000055555555555555555555555555555555555555555555555555555555550000000000000000005555555555555555555555555555555555555555555555555555555500000000000000000000555555555555555555555555555555555555555555555555555555000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000055500005550055005500555555500000005550000000000000000000000000000000000000055500005555555555505550005550000005555000000000000000000000000000000000000005550000555555555000555555550000055555000000000000000000000000000000006000005550000555000000000055555550000555055500000000000000000000000000000000000005550000055500000000000000555000555005550000000000000000000000000000000000000550000055500000000000000555005550005550000000000000000000000000000000000000550000055000000000000000055000500000500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
جاسازی بهینه n دایره در یک دایره، بطوری که فضای آزاد بین دایره ها کمترین باشد، یکی از مسائل رایج در ریاضیات کاربردی است. یافتن این چیدمانهای بهینه برای برخی از مقادیر n چندان هم ساده نیست. به عنوان مثال برای n=13، مساله تا سال 2003 حل نشده بود.
قطر دایره های کوچک در تصویر 1 است و قطر دایره دربرگیرنده هر گروه زیر آن نوشته شده است. مثلا میتوان 12 دایره به قطر واحد را در یک دایره به قطر 4.029 جا داد.
