A051478 a(n) is the number of values k satisfying phi(k) = 4*n+2, n>0.

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

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(k)=4*1+2 has 4 solutions (k=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