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 A073456 Numbers n such that to phi(n) = pi(n)+1. 3
 1, 5, 36, 48, 84 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA Solutions to A000010(x)=A000720(x)+k, where k=+1; finite for any fixed value of k. EXAMPLE 15 primes below 48 = {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47}; 16 terms in RRS[48]={1,5,7,11,13,17,19,23,25,29,31,35,37,41,43,47}, so 48 is here. MATHEMATICA Do[s=EulerPhi[n]-PrimePi[n]; If[Equal[s, 1], Print[n]], {n, 1, 10000}] CROSSREFS Cf. A037228, A037171, A000010, A000720, A073455. Sequence in context: A263882 A035416 A042029 * A275223 A003350 A217166 Adjacent sequences:  A073453 A073454 A073455 * A073457 A073458 A073459 KEYWORD fini,full,nonn AUTHOR Labos Elemer, Aug 02 2002 STATUS approved

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Last modified September 21 15:50 EDT 2020. Contains 337272 sequences. (Running on oeis4.)