A080567 1 + Sum_{k=2..n} 2^((prime(k)-1)/2).

1, 3, 7, 15, 47, 111, 367, 879, 2927, 19311, 52079, 314223, 1362799, 3459951, 11848559, 78957423, 615828335, 1689570159, 10279504751, 44639243119, 113358719855, 663114533743, 2862137789295, 20454323833711, 301929300544367

Offset

1,2

Comments

Take an initial segment of A080545, stopping at the n-th 1, reverse and interpret as a binary number.

Links

Table of n, a(n) for n=1..25.

Crossrefs

Cf. A080355, A080545.

Sequence in context: A097111 A371914 A151401 * A276969 A146448 A192169

Adjacent sequences: A080564 A080565 A080566 * A080568 A080569 A080570

Keyword

nonn,easy

Author

N. J. A. Sloane, based on information supplied by Artur Jasinski, Mar 21 2003

Extensions

More terms from Vladeta Jovovic, Mar 26 2003

Status

approved