A127565 Floor (sum_{k=1..n} log(log(prime(k)))).

-1, -1, 0, 0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 12, 13, 15, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 39, 40, 42, 43, 45, 47, 48, 50, 51, 53, 55, 56, 58, 60, 61, 63, 65, 66, 68, 70, 72, 73, 75, 77, 78, 80, 82, 84, 85, 87, 89, 91, 92, 94, 96, 98, 99, 101, 103, 105, 106, 108, 110, 112, 113, 115, 117, 119, 121, 122, 124, 126

Offset

1,6

Links

Table of n, a(n) for n=1..83.

Mathematica

Table[Floor[N[Sum[Log[Log[Prime[x]]], {x, 1, n}]]], {n, 1, 1000}]

Crossrefs

Cf. A016040.

Sequence in context: A267303 A267307 A032974 * A082186 A099849 A071163

Adjacent sequences: A127562 A127563 A127564 * A127566 A127567 A127568

Keyword

sign

Author

Artur Jasinski, Jan 18 2007

Status

approved