Numbers 990,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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990,025

[Math.]  9952 = 990,025.

 

990,100

[Math.]  10,100 = 102+1002 and 990,100 = 9902+1002, where 990+10 = 1000.

 

992,016

[Math.]  9962 = 992,016.

 

993,319

[Math.]  Circular prime numbers: all 6 numbers 199933, 999331, 993319, 933199, 331999 and 319993 are prime.

 

994,708

[Math.]  28,005,264 = (28+005264)2 = 52922 and 989,444,005,264 = (989444+005264)2 = 994,7082 and 5292+994708 = 1,000,000.

 

995,328

[Math.]  995,328 = 65×43×21.

 

997,633

[Math.]  The largest 6-digit Carmichael number: 997,633 = 7×13×19×577.

 

998,001

[Math.]  998,001 = (998+001)2 = 9992. The largest 6-digit square number.

 

998,104

[Math.]  A pair of amicable numbers (998104, 1043096), one of 2 pairs involving a 6-digit and a 7-digit number.

 

998,999

[Math.]  The reciprocal of numbers in the series 89, 9899, 998999… (i.e, of the form (102n–10n–1), for n ³ 1) contains n rightmost digit of the first nth Fibonacci numbers up to the second biggest n-digit Fibonacci number:

1/998999 = 0.000001001002003005008013021034055089144233377610988…

 

999,000s (separate page)

 

999,999 (separate page)