Numbers 71,000,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

70,000,000 71,000,00072,000,00073,000,000 – 74,000,000

75,000,00076,000,00077,000,00078,000,00079,000,000

All Numbers  & [1M] & [10M- [20M] - [30M] - [40M] - [50M] - [60M] - [70M] - [80M] - [90M]  &  [100M]

1  - 10 - 100  - 1000 - 10,000 - 100,000 - 1M - 10M - 100M1B10B - 100B - 1T - 10T - 100T - 1Q ...

71,015,260

[Math.]  A pair of amicable numbers (71015260, 85458596).

 

71,111,111

[Math.]  A prime number, formed by 1 digit 7 and 7 adjacent digits 1.  The number 11,111,117 is also a prime number.

 

71,111,117

[Math.]  

8×8+13 = 77      

88×8+13 = 717

888×8+13 = 7117

8888×8+13 = 71117

88,888×8+13 = 711,117

888,888×8+13 = 7,111,117

8,888,888×8+13 = 71,111,117

88,888,888×8+13 = 711,111,117

888,888,888×8+13 = 7,111,111,117

8,888,888,888×8+13 = 71,111,111,117

...

 

71,241,830

[Math.]  A pair of amicable numbers (71241830, 78057370).

 

71,340,451

[Math.]  The sum s(n) = 14n+2+24n+2+34n+2+44n+2+54n+2+64n+2 is always divisible by 13 for any positive integer n: s(2) = 110+210+310+410+510+610 = 71,340,451.

 

71,465,328

[Math.] (References [1])

Pan-digital number

2× a zero-less

pan-digital number

Uses each of

9 digits 1-9 once

1,037,246,958

= 2×518,623,479

= 9×57,624,831

1,046,389,752

= 2×523,194,876

= 9×58,132,764

1,286,375,904

= 2×643,187,952

= 9×71,465,328

1,307,624,958

= 2×653,812,479

= 9×72,645,831

1,370,258,694

= 2×685,129,347

= 9×76,125,483

1,462,938,570

= 2×731,469,285

= 9×81,274,365

 

71,639,296

[Math.]  71,639,296 = (–7+1+6–3+92+9–6)4 = 924.

 

71,946,890

[Math.]  A pair of amicable numbers (66854710, 71946890).

 

xy,abc,def

[Math.]  For any xy = 10 to 99, there are always six 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 6 digit-rotations of 142,857 and the number xy,abc,def is a multiple of 142,857.

 

For any xy = 10 to 99, there are always twelve 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 12 digit-rotations of 076,923 or 153,846 and the number xy,abc,def is a multiple of 76,923.