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A134721
Bisection of Mersenne primes A000668.
3
3, 31, 8191, 524287, 2305843009213693951, 162259276829213363391578010288127
OFFSET
1,1
FORMULA
a(n) = A000668(2*n - 1).
EXAMPLE
a(3) = 8191 because the (2*3-1=5)th Mersenne prime is 8191.
CROSSREFS
Sequence in context: A048562 A022499 A129209 * A002707 A283247 A261472
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Nov 11 2007
STATUS
approved