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Search: id:A135576
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A135576 Numbers whose representation in base 2 has only the digit "1" as first, central and final digit. +0
4
1, 7, 21, 73, 273, 1057, 4161, 16513, 65793, 262657, 1049601, 4196353, 16781313, 67117057, 268451841, 1073774593, 4295032833, 17180000257, 68719738881, 274878431233, 1099512676353, 4398048608257, 17592190238721 (list; graph; listen)
OFFSET

1,2

COMMENT

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

FORMULA

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

EXAMPLE

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

--------------------------------------

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

CROSSREFS

Cf. A001576, A135577.

Adjacent sequences: A135573 A135574 A135575 this_sequence A135577 A135578 A135579

Sequence in context: A005032 A082541 A113859 this_sequence A110683 A092785 A114902

KEYWORD

nonn

AUTHOR

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

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Last modified October 6 16:09 EDT 2008. Contains 144667 sequences.


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