A098389 - OEIS

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A098389

Prime(n) - floor(log_2(prime(n))).

1, 2, 3, 5, 8, 10, 13, 15, 19, 25, 27, 32, 36, 38, 42, 48, 54, 56, 61, 65, 67, 73, 77, 83, 91, 95, 97, 101, 103, 107, 121, 124, 130, 132, 142, 144, 150, 156, 160, 166, 172, 174, 184, 186, 190, 192, 204, 216, 220, 222, 226, 232, 234, 244, 249, 255, 261, 263, 269, 273

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

a(n) = A000040(n) - A098388(n).

LINKS

Table of n, a(n) for n=1..60.

EXAMPLE

a(10) = A000040(10) - A098388(10) = 29 - 4 = 25.

MATHEMATICA

#-Floor[Log[2, #]]&/@Prime[Range[60]] (* Harvey P. Dale, Nov 06 2011 *)

PROG