Write f=sumcifi as a sum over new eigenforms. Your condition is thus equivalent to sumcilambdai(p)=0 for all p. Taking the absolute value squared of this and summing over pleqX gives
0=sumi,jcioverlinecjsumpleqXlambdai(p)overlinelambdaj(p).
By the pnt for Rankin-Selberg L-functions, the inner sum over primes is simX(logX)−1 if i=j, and is o(X(logX)−1) otherwise. Taking X very large we obtain 0=cX(logX)−1+o(X(logX)−1), so contradiction.
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