A104195 - OEIS

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A104195

a(n) = -(phi(n) + CarmichaelLambda(n)) + prime(n).

0, 1, 1, 3, 3, 9, 5, 13, 11, 21, 11, 31, 17, 31, 35, 41, 27, 49, 31, 59, 55, 59, 39, 79, 57, 77, 67, 89, 53, 101, 67, 107, 107, 107, 113, 133, 85, 127, 131, 153, 99, 163, 107, 163, 161, 155, 119, 203, 143, 189, 185, 203, 137, 215, 197, 233, 215, 215, 161, 261, 163, 233

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

OFFSET

1,4

LINKS

Table of n, a(n) for n=1..62.

FORMULA

a(n) = A000040(n) - A000010(n) - A002322(n).

MATHEMATICA

a= Table[ -(EulerPhi[n] + CarmichaelLambda[n]) + Prime[n], {n, 1, 200}]

PROG

(PARI) a(n) = prime(n) - eulerphi(n) - lcm(znstar(n)[2]); \\ Michel Marcus, Mar 18 2016

CROSSREFS