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A080567
1 + Sum_{k=2..n} 2^((prime(k)-1)/2).
13
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.
CROSSREFS
Sequence in context: A097111 A371914 A151401 * A276969 A146448 A192169
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