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A175824
Maximum unsigned integer that can be stored in n bytes.
2
0, 255, 65535, 16777215, 4294967295, 1099511627775, 281474976710655, 72057594037927935, 18446744073709551615, 4722366482869645213695, 1208925819614629174706175, 309485009821345068724781055
OFFSET
0,2
COMMENTS
All a(n) for n > 0 are Mersenne numbers. None are Mersenne primes.
FORMULA
a(n) = 2^(8*n) - 1.
a(n) = (A001025(n) - 1) * (A024036(n)^2 + A004171(n)); this relation is (x^(8*n)-1) = (x^(4*n)-1)*((x^(2*n)-1)^2 + 2*x^(2*n)) for x=2. [Reinhard Zumkeller, Jun 23 2011]
EXAMPLE
a(0) = 2^0 - 1 = 1 - 1 = 0
a(1) = 2^8 - 1 = 256 - 1 = 255
a(2) = 2^16 - 1 = 65536 - 1 = 65535
a(3) = 2^24 - 1 = 16777216 - 1 = 16777215
MATHEMATICA
Table[2^(8n) - 1, {n, 0, 11}]
PROG
(Python)
print([2**(8 * i) - 1 for i in range(12)])
CROSSREFS
Cf. A000225. Equals A133752 minus one.
Sequence in context: A022190 A267545 A069383 * A238996 A069409 A069435
KEYWORD
easy,nonn
AUTHOR
Grant Garcia, Sep 13 2010
STATUS
approved