Those Fascinating Numbers 405
23 021 376(23 021 377
1)
the
37th
even perfect number, a 1 819 050 digit number.
26 972 593 1
the
38th
Mersenne prime, a 2 098 960 digit number (see the number 6 972 593).
2223
+ 1
the
24th
Fermat number, a 2 525 223 digit number; it is composite and its largest
prime factor, discovered by Pervouchine in 1878, is 167 772 161 =
225
+1 (see
the number 70 525 124 609).
213 466 917 1
the
39th
Mersenne prime, a 4 053 946 digit number (see the number 13 466 917).
26 972 592(26 972 593 1)
the
38th
even perfect number, a 4 197 919 digit number.
2224
+ 1
the
25th
Fermat number, a 5 050 446 digit number; it was established in 1999
that it was a composite number (see the number 70 525 124 609).
220 996 011
1
the
40th
Mersenne prime, a 6 320 430 digit number (see the number 20 996 011).
224 036 183
1
the
41rst
Mersenne prime, a 7 235 733 digit number (see the number 24 036 183).
225 964 951 1
the
42nd
Mersenne prime, a 7 816 230 digit number (see the number 25 964 951).
213 466 916(213 466 917
1)
the
39th
even perfect number, a 8 107 891 digit number.
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