1,1

a(n) = A000040(n) - A133578(n)

a(1) = 2 - 4 = -2 -> for prime 2

a(2) = 3 - 6 = -3 -> for prime 3

a(3) = 5 - 9 = -4 -> for prime 5

a(4) = 7 - 11 = -4 -> for prime 7

a(5) = 11 - 14 = -3 -> for prime 11

Cf. A133578, A000040.

Sequence in context: A014292 A066078 A058339 this_sequence A093150 A090281 A051951

Adjacent sequences: A133849 A133850 A133851 this_sequence A133853 A133854 A133855

sign

Alexander R. Povolotsky (pevnev(AT)juno.com), Jan 06 2008