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A051478 Number of values of n satisfying phi(n)=4i+2, i>0. 1
4, 2, 0, 4, 2, 0, 2, 0, 0, 4, 2, 0, 2, 2, 0, 2, 2, 0, 2, 2, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 2, 0, 2, 0, 0, 2, 0, 0, 4, 2, 0, 0, 2, 0, 0, 2, 0, 2, 0, 0, 2, 0, 0, 2, 2, 0, 0, 2, 0, 0, 2, 0, 0, 2, 0, 2, 0, 0, 2, 0, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, 2, 0, 0, 2, 2, 0, 0, 2, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Sequence consists of only 0's, 2's and 4's.

LINKS

Table of n, a(n) for n=1..103.

EXAMPLE

phi(n)=4*1+2 has 4 solutions (n=7, 9, 14, 18), so a(1)=4.

CROSSREFS

Cf. A000010, A032446, A051479.

Sequence in context: A048819 A076114 A294666 * A121829 A021708 A016690

Adjacent sequences:  A051475 A051476 A051477 * A051479 A051480 A051481

KEYWORD

nonn

AUTHOR

Jud McCranie

STATUS

approved

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Last modified December 7 17:41 EST 2019. Contains 329847 sequences. (Running on oeis4.)