OFFSET
0,1
COMMENTS
a(62) = 1294268491, a(64) = 2300942549.
LINKS
Giovanni Resta, Table of n, a(n) for n = 0..91
FORMULA
a(n) is the prime precessing A228170(n-1).
EXAMPLE
a(2) = 7 since between 7 and the next prime, 11, there are 2 semiprimes (9, 10).
MATHEMATICA
t = Table[0, {100}]; p=3; While[p < 3100000000, q = NextPrime[p]; a = Count[ PrimeOmega[ Range[p, q]], 2]; If[ t[[a]] == 0, t[[a]] = p; Print[{p, a}]]; p = q]; t
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved