OFFSET
1,1
COMMENTS
Sequence of least prime with the number of 1's in its binary representation equal to n-th semiprime is: 23,311,991,2039,73727,63487,4128767,... What is the prime corresponding to 22?
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
The prime 43 = '101011' has four 1's and so is a term.
MATHEMATICA
seqQ[n_] := PrimeQ[n] && PrimeOmega[DigitCount[n, 2, 1]] == 2; Select[Range[1000], seqQ] (* Amiram Eldar, Dec 14 2019 *)
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Jason Earls, Aug 14 2003
STATUS
approved