Left factorials: Difference between revisions

=={{header|Nimrod}}==

{{trans|Python}}

<lang nimrod>import iterutils, bigints

proc lfact: iterator: BigInt =

result = iterator: BigInt =

yield 0.initBigInt

var

fact = 1.initBigInt

sum = 0.initBigInt

n = 1.initBigInt

while true:

sum += fact

fact *= n

n += 1

yield sum

echo "first 11:\n "

for i in lfact().slice(last = 10):

echo " ", i

echo "20 through 110 (inclusive) by tens:"

for i in lfact().slice(20, 110, 10):

echo " ", i

echo "Digits in 1,000 through 10,000 (inclusive) by thousands:"

for i in lfact().slice(1_000, 10_000, 1_000):

echo " ", ($i).len</lang>

Output:

<pre>first 11:

0

1

2

4

10

34

154

874

5914

46234

409114

20 through 110 (inclusive) by tens:

128425485935180314

9157958657951075573395300940314

20935051082417771847631371547939998232420940314

620960027832821612639424806694551108812720525606160920420940314

141074930726669571000530822087000522211656242116439949000980378746128920420940314

173639511802987526699717162409282876065556519849603157850853034644815111221599509216528920420940314

906089587987695346534516804650290637694024830011956365184327674619752094289696314882008531991840922336528920420940314

16695570072624210767034167688394623360733515163575864136345910335924039962404869510225723072235842668787507993136908442336528920420940314

942786239765826579160595268206839381354754349601050974345395410407078230249590414458830117442618180732911203520208889371641659121356556442336528920420940314

145722981061585297004706728001906071948635199234860720988658042536179281328615541936083296163475394237524337422204397431927131629058103519228197429698252556442336528920420940314

Digits in 1,000 through 10,000 (inclusive) by thousands:

2565

5733

9128

12670

16322

20062

23875

27749

31678

35656</pre>