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 A328056 Numbers k such that phi(k) > phi(k+1) > phi(k+2) where phi is the Euler totient function (A000010). 2
 313, 523, 733, 823, 824, 943, 944, 973, 1153, 1363, 1573, 1753, 1783, 1813, 1993, 2143, 2413, 2473, 2623, 2803, 3043, 3133, 3134, 3253, 3313, 3463, 3703, 3883, 4093, 4123, 4303, 4387, 4388, 4513, 4723, 4873, 4874, 4933, 5113, 5143, 5353, 5443, 5444, 5563, 5564 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Contains all members k of A206581 such that k==103 (mod 210) except 103.- Robert Israel, Oct 16 2019 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE 313 is in the sequence since phi(313) = 312, phi(314) = 156, phi(315) = 144, and 312 > 156 > 144. MAPLE R:= NULL: count:= 0: q:= false: s:= 0: for i from 1 while count < 100 do t:= numtheory:-phi(i); r:= q; q:= evalb(t

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Last modified March 27 18:55 EDT 2023. Contains 361575 sequences. (Running on oeis4.)