1,2

This sequence is equal to A001576, except for the first member of each sequence.

a(1)=1. If n>1 then a(n)=A001576(n-1)

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n ........ a(n) ..... a(n) in base 2

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1 .......... 1 ............ 1

2 .......... 7 ........... 111

3 ......... 21 .......... 10101

4 ......... 73 ......... 1001001

5 ........ 273 ........ 100010001

6 ....... 1057 ....... 10000100001

7 ....... 4161 ...... 1000001000001

8 ...... 16513 ..... 100000010000001

9 ...... 65793 .... 10000000100000001

10 .... 262657 ... 1000000001000000001

Cf. A001576, A135577.

Adjacent sequences: A135573 A135574 A135575 this_sequence A135577 A135578 A135579

Sequence in context: A005032 A082541 A113859 this_sequence A110683 A092785 A114902

nonn

Omar E. Pol (info(AT)polprimos.com), Feb 24 2008