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A066362 a(n) = least k > n such that phi(k) < phi(n), if such a k exists; otherwise a(n) = 0. 1
0, 0, 0, 0, 6, 0, 8, 0, 10, 0, 12, 0, 14, 0, 18, 18, 18, 0, 20, 0, 22, 24, 24, 0, 26, 30, 28, 30, 30, 0, 32, 36, 34, 36, 36, 0, 38, 40, 40, 42, 42, 0, 44, 48, 46, 48, 48, 0, 50, 54, 52, 54, 54, 60, 56, 60, 58, 60, 60, 0, 62, 66, 64, 66, 66, 0, 68, 70, 70, 0, 72, 0, 74, 78, 76, 78, 78, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

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

LINKS

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

EXAMPLE

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).

CROSSREFS

Cf. A000010, A036912, A036913.

Sequence in context: A245700 A201521 A011393 * A279929 A244812 A083680

Adjacent sequences:  A066359 A066360 A066361 * A066363 A066364 A066365

KEYWORD

nonn

AUTHOR

Joseph L. Pe, Dec 20 2001

EXTENSIONS

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

STATUS

approved

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Last modified September 19 17:11 EDT 2021. Contains 347564 sequences. (Running on oeis4.)