1,5

If a(n) = 0, then from n onwards, phi will not go below its value at n.

The first odd term in this sequence is a(314) = 315. - Franklin T. Adams-Watters, Oct 25 2006

Table of n, a(n) for n=1..78.

a(2) = 0 since there is no k > 2 for which phi(k) < 1 = phi(2). a(5) = 6 since for k = 6, phi(6) = 2 < 4 = phi(5).

Cf. A000010, A036912, A036913.

Sequence in context: A245700 A201521 A011393 * A279929 A244812 A083680

Adjacent sequences: A066359 A066360 A066361 * A066363 A066364 A066365

nonn

Joseph L. Pe, Dec 20 2001

More terms from Franklin T. Adams-Watters, Oct 25 2006

approved