338 Jean-Marie De Koninck
1 082 640 256
the
22nd
dihedral perfect number (see the number 130).
1 111 112 112
the sixth insolite number (see the number 111).
1 111 211 136
the seventh insolite number (see the number 111).
1 116 122 112
the eighth insolite number (see the number 111).
1 152 597 606
the fourth number which is not the square of a prime number, but which
can be written as the sum of the squares of some of its prime factors: here
1 152 597 606 = 2 · 3 · 5741 · 33461 = 22 + 57412 + 334612 (see the number 870).
1 178 491 680
the
12th
number n such that φ(n) + σ(n) = 4n (see the number 23 760).
1 211 162 112
the ninth insolite number (see the number 111).
1 214 251 009
the smallest prime factor of F15 =
2215
+ 1, whose partial factorization is given
by
F15 = 1214251009 · 2327042503868417
·168768817029516972383024127016961 · C9808.
1 220 640 625 (=
56
· 78121)
the second 4-hyperperfect number (see the number 1 950 625).
1 268 860 318
the second number n such that n2 + 1 is powerful (see the number 682): here
1 268 860 3182 + 1 = 53 · 172 · 612 · 1094412.
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