A191682 Twice A113473.

2, 4, 4, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10

Offset

1,1

Comments

Arises in a renewal problem. Suppose X(1), X(2), ... are independent and identically distributed random variables with P(X = 1) = P(X = 2) = 0.5, and let N(n) denote the first value of k such that X(1)*X(2)*...*X(k) > x. Then a(n) gives the expected value of N(n), n = 1, 2, 3, ...

Links

Table of n, a(n) for n=1..31.

Crossrefs

Cf. A113473.

Sequence in context: A251546 A282894 A162550 * A113724 A161794 A111650

Adjacent sequences: A191679 A191680 A191681 * A191683 A191684 A191685

Keyword

nonn,easy,less

Author

Edward Omey, Jun 11 2011

Status

approved