Those Fascinating Numbers 375
230 283 190 977 853
the
15th
horse number (see the number 13).
232 630 479 398 401 (=
78
· 40353601)
a 6-hyperperfect number, possibly the sixth one (see the number 301).
248 155 780 267 521
the largest number n whose sum of digits is equal to
8

n (see the number
20 047 612 231 936).
249 393 770 611 256
the number of 16 digit prime numbers.
250 058 907 189 001
the smallest sixth power which can be written as the sum of eight sixth powers:
250 058 907 189 001 = 2516 = 86 + 126 + 306 + 786 + 1026 + 1386 + 1656 + 2466.
274 859 381 237 761 (= 31 · 61 · 73 · 109 · 991 · 18433)
the smallest value of X such that C(X) X
1/3,
where C(X) stands for the
number of Carmichael numbers X: here C(274 859 381 237 761) = 65 019
274 859 381 237 7611/3 = 65 018.48 . . . (see R.G.E. Pinch [162] as well as the
number 646).
279 238 341 033 925
the number of prime numbers
1016.
323 113 121 114 112
the
69th
insolite number (see the number 111); it is the smallest insolite number
whose first three digits are different from 1.
432 749 205 173 838 (= 2 · 3 · 7 · 59 · 163 · 1381 · 775 807)
the seventh Giuga number (see the number 30).
443 372 888 629 441 (= 17 · 31 · 41 · 43 · 89 · 97 · 167 · 331)
the smallest known Carmichael number n such that p|n =⇒ p2 1|n 1
(R. Pinch; see R.K. Guy [101], A13).
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