OFFSET
1,1
COMMENTS
The least number having exactly two odd prime factors that differ by 2^n is given by the sequence A190358.
EXAMPLE
a(5) = 37 because A190358(5) = 185 = 5 * 37 , and 37 is the largest prime divisor
such that 37 - 5 = 32 = 2^5.
MAPLE
with(numtheory):for m from 1 to 30 do: k:=2^m:id:=0:for n from 1 to 900000000
while(id=0) do: x:=factorset(n):n1:=nops(x):n2:=bigomega(n):if n1=2 and n2=2
and x[2]=x[1]+k then id:=1:printf(`%d, `, x[2]):else fi:od:od:
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, May 09 2011
STATUS
approved