A241673 Where powers of 2 occur in A229037.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 51, 56, 57, 64, 69, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 96, 97, 98, 99, 100, 101

Offset

1,2

Comments

A209229(A229037(a(n))) = 1.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Example

.    n  |    a(n)  | A229037(a(n))=2^k |    k
. ------+----------+-------------------+------
.    1  |       1  |             1     |    0
.    3  |       3  |             2     |    1
.    8  |       8  |             4     |    2
.   22  |      24  |             8     |    3
.   92  |     196  |            16     |    4
.  139  |     387  |            32     |    5
.  155  |     516  |            64     |    6
.  250  |    1274  |           128     |    7
.  371  |    3590  |           256     |    8
.  560  |    9309  |           512     |    9
.  851  |   23654  |          1024     |   10 .

Prog

(Haskell)
a241673 n = a241673_list !! (n-1)
a241673_list = filter ((== 1) . a209229 . a229037) [1..]

Crossrefs

Cf. A236246 (subsequence).

Sequence in context: A076499 A092629 A246101 * A258009 A108192 A250395

Adjacent sequences: A241670 A241671 A241672 * A241674 A241675 A241676

Keyword

nonn

Author

Reinhard Zumkeller, Apr 26 2014

Status

approved