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

Author

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

Keywords

• nonn
• easy

Comments

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

Crossrefs

Cf. A080355, A080545.

Extensions

More terms from Vladeta Jovovic, Mar 26 2003