OFFSET
1,5
LINKS
FUNG Cheok Yin, Table of n, a(n) for n = 1..10000
Andy Loo, On the Primes in the Interval [3n, 4n], arXiv:1110.2377 [math.NT], 2011.
MATHEMATICA
Join[{1}, Rest[Table[PrimePi[4n]-PrimePi[3n], {n, 80}]]] (* Harvey P. Dale, Dec 30 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
FUNG Cheok Yin, Jul 07 2017
STATUS
approved