OFFSET
1,2
COMMENTS
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10000
EXAMPLE
a(5) = 9; pi(5) * pi(6) = 3 * 3 = 9.
a(6) = 12; pi(6) * pi(7) = 3 * 4 = 12.
MATHEMATICA
Table[PrimePi[n]*PrimePi[n + 1], {n, 100}]
PROG
(PARI) vector(100, n, primepi(n)*primepi(n+1)) \\ Derek Orr, Apr 13 2015
(Magma) [ #PrimesUpTo(n) * #PrimesUpTo(n+1): n in [1..80] ]; // Vincenzo Librandi, Apr 14 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Apr 13 2015
EXTENSIONS
Comment clarified by Antti Karttunen, Apr 18 2015
STATUS
approved