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Test and improved the generators.

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Cédric Bonhomme 2017-03-01 07:53:10 +01:00
parent b9fad5f044
commit 091f33c521
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2 changed files with 91 additions and 5 deletions
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12
stegano/lsbset/generators.py
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@ -44,7 +44,7 @@ def Dead_Man_Walking():
yield n + 7
n += 2
def OEIS_A000217():
def triangular_numbers():
"""http://oeis.org/A000217
Triangular numbers: a(n) = C(n+1,2) = n(n+1)/2 = 0+1+2+...+n.
"""
@ -54,17 +54,19 @@ def OEIS_A000217():
n += 1
def fermat():
"""Generate the n-th Fermat Number.
"""https://oeis.org/A000215
Generate the n-th Fermat Number.
"""
y = 5
y = 3
while True:
yield y
y = pow(y-1,2)+1
def mersenne():
"""Generate 2^n-1.
"""https://oeis.org/A001348
Generate 2^n - 1.
"""
y = 1
y = 3
while True:
yield y
y = 2*y + 1