login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A225243 Table read by rows, where row n contains the distinct primes that are contained in binary representation of n; first row = [1] by convention. 7
1, 2, 3, 2, 2, 5, 2, 3, 3, 7, 2, 2, 2, 5, 2, 3, 5, 11, 2, 3, 2, 3, 5, 13, 2, 3, 7, 3, 7, 2, 2, 17, 2, 2, 3, 19, 2, 5, 2, 5, 2, 3, 5, 11, 2, 3, 5, 7, 11, 23, 2, 3, 2, 3, 2, 3, 5, 13, 2, 3, 5, 11, 13, 2, 3, 7, 2, 3, 5, 7, 13, 29, 2, 3, 7, 3, 7, 31, 2, 2, 2, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row n = primes in row n of tables A165416 or A119709.

LINKS

Reinhard Zumkeller, Rows n = 1..1024 of table, flattened

EXAMPLE

.   n   T(n,*)              |  in binary

.  ---  --------------------|-------------------------------------------

.   1:  1                   |  00001:  .

.   2:  2                   |  00100:  ___10

.   3:  3                   |  00011:  ___11

.   4:  2                   |  00100:  __10_

.   5:  2  5                |  00101:  ___10 _11__

.   6:  2  3                |  00110:  ___10 __11_

.   7:  3  7                |  00111:  __11_ __111

.   8:  2                   |  01000:  _10__

.   9:  2                   |  01001:  _10__

.  10:  2  5                |  01010:  _10__ _101_

.  11:  2  3  5 11          |  01011:  _10__ ___11 _101_ 01011

.  12:  2  3                |  01100:  ___10 _11__

.  13:  2  3  5 13          |  01101:  __10_ _11__ __101 01101

.  14:  2  3  7             |  01110:  ___10 _11__ _111_

.  15:  3  7                |  01111:  _11__ _111_

.  16:  2                   |  10000:  10___

.  17:  2 17                |  10001:  10___ 10001

.  18:  2                   |  10010:  10___

.  19:  2  3 19             |  10011:  10___ ___11 10011

.  20:  2  5                |  10100:  10___ 101__

.  21:  2  5                |  10101:  10___ 101__

.  22:  2  3  5 11          |  10110:  10___ __11_ 101__ 10110

.  23:  2  3  5  7 11 23    |  10111:  10___ __11_ 101__ __111 1011_ 10111

.  24:  2  3                |  11000:  _10__ 11___

.  25:  2  3                |  11001:  _10__ 11___ .

PROG

(Haskell)

a225243 n k = a225243_tabf !! (n-1) !! (k-1)

a225243_row n = a225243_tabf !! (n-1)

a225243_tabf = [1] : map (filter ((== 1) . a010051')) (tail a165416_tabf)

CROSSREFS

Cf. A078826 (row lengths), A078832 (left edge), A078833 (right edge), A004676, A007088.

Sequence in context: A292588 A225176 A118665 * A207338 A027746 A240230

Adjacent sequences:  A225240 A225241 A225242 * A225244 A225245 A225246

KEYWORD

nonn,tabf

AUTHOR

Reinhard Zumkeller, Aug 14 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 13 00:17 EST 2017. Contains 295954 sequences.