A178503 - OEIS

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A178503

n minus totally additive with a(p)=PrimePi(p), where PrimePi(n)=A000720(n).

1, 1, 1, 2, 2, 3, 3, 5, 5, 6, 6, 8, 7, 9, 10, 12, 10, 13, 11, 15, 15, 16, 14, 19, 19, 19, 21, 22, 19, 24, 20, 27, 26, 26, 28, 30, 25, 29, 31, 34, 28, 35, 29, 37, 38, 36, 32, 42, 41, 43, 42, 44, 37, 47, 47, 49, 47, 47, 42, 53, 43, 50, 55, 58, 56, 58, 48, 59, 58, 62, 51, 65, 52, 61

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..74.

FORMULA

a(n) = A000027(n) - A056239(n).

MAPLE

From R. J. Mathar, Apr 20 2010: (Start)

A056239 := proc(n) add( numtheory[pi](op(1, p))*op(2, p), p = ifactors(n)[2]) ; end proc:

A178503 := proc(n) n-A056239(n) ; end proc: seq(A178503(n), n=1..80) ; (End)

CROSSREFS