OFFSET
1,1
COMMENTS
2 together with the number of primes between successive semiprimes.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A088700(n-1) for n >= 2.
EXAMPLE
MATHEMATICA
Join[{2}, -1 + Differences[Position[Select[PrimeOmega[Range[400]], # < 3 &], 2] // Flatten]] (* Amiram Eldar, Sep 07 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, Apr 18 2010
STATUS
approved