400 Jean-Marie De Koninck
219 937
1
the 24th Mersenne prime, a 6 002 digit number.
221 701 1
the
25th
Mersenne prime, a 6 533 digit number.
211 212(211 213
1)
the
23rd
even perfect number, a 6 751 digit number.
223 209 1
the 26th Mersenne prime, a 6 987 digit number.
2215
+ 1
the
16th
Fermat number, a 9 865 digit number; it is a composite number, whose
smallest prime factor, namely
1 214 251 009 = 579 ·
221
+ 1,
was obtained by Kraitchik in 1925 (see the number 70 525 124 609).
219 936(219 937 1)
the 24th even perfect number, a 12 003 digit number.
221 700(221 701 1)
the 25th even perfect number, a 13 066 digit number.
244 497 1
the
27th
Mersenne prime, a 13 395 digit number.
223 208(223 209
1)
the
26th
even perfect number, a 13 973 digit number.
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