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A066705 Greatest k < n such that phi(k) = phi(n) if such k exists, otherwise 0. 0
0, 1, 0, 3, 0, 4, 0, 5, 7, 8, 0, 10, 0, 9, 0, 15, 0, 14, 0, 16, 13, 11, 0, 20, 0, 21, 19, 26, 0, 24, 0, 17, 25, 32, 0, 28, 0, 27, 35, 34, 0, 36, 0, 33, 39, 23, 0, 40, 43, 44, 0, 45, 0, 38, 41, 52, 37, 29, 0, 48, 0, 31, 57, 51, 0, 50, 0, 64, 0, 56, 0, 70, 0, 63, 55, 74, 61, 72, 0, 68, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..81.

CROSSREFS

Cf. A000010, A015126, A028476, A043343, A066659.

Sequence in context: A297217 A218859 A246691 * A277894 A027636 A173425

Adjacent sequences:  A066702 A066703 A066704 * A066706 A066707 A066708

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jan 14 2002

STATUS

approved

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)