|
|
A292937
|
|
a(0)=1, followed by highly safe primes: positions of records in A292936.
|
|
1
|
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
The starting offset is 0 to accommodate 1, which is only nonprime in this sequence, and also to align with the indexing used in A110056.
Sequence starts like A007505, and at least for terms a(5) .. a(9) is equal to A110056.
|
|
LINKS
|
|
|
MATHEMATICA
|
With[{s = Table[SelectFirst[Range[0, 10], ! PrimeQ@ Floor[n/(2^#)] &], {n, 10^7}]}, Map[FirstPosition[s, #][[1]] &, Union@ FoldList[Max, s]]] (* Michael De Vlieger, Sep 29 2017 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,more
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|