A085345 Least number x such that number of primes between phi(x) and x equals n.

2, 6, 12, 18, 24, 30, 50, 42, 48, 66, 60, 78, 96, 84, 90, 130, 108, 176, 114, 132, 156, 182, 150, 168, 186, 180, 216, 198, 228, 429, 210, 258, 308, 240, 276, 282, 270, 306, 294, 300, 354, 366, 336, 330, 384, 378, 396, 360, 432, 438, 622, 444, 390, 490, 474, 498

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Formula

a(n)=Min{x; A085342(x)=n}

Maple

N:= 200: # for a(1)..a(N)
V:= Vector(N):
count:= 0:
for x from 1 while count < N do
  v:= numtheory:-pi(x) - numtheory:-pi(numtheory:-phi(x));
  if v >= 1 and v <= N and V[v] = 0 then
    V[v]:= x; count:= count+1;
  fi
od:
convert(V, list); # Robert Israel, Aug 23 2018

Crossrefs

Cf. A000720, A000010, A000203, A070803, A070804, A085341-A085347.

Sequence in context: A069087 A367504 A304450 * A348774 A265843 A276829

Adjacent sequences: A085342 A085343 A085344 * A085346 A085347 A085348

Keyword

nonn

Author

Labos Elemer, Jul 10 2003

Status

approved