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A106477 Diagonal sums of Euler phi function sequence array. 3
1, 1, 3, 3, 7, 5, 13, 9, 19, 13, 29, 17, 41, 23, 49, 31, 65, 37, 83, 45, 95, 55, 117, 63, 137, 75, 155, 87, 183, 95, 213, 111, 233, 127, 257, 139, 293, 157, 317, 173, 357, 185, 399, 205, 423, 227, 469, 243, 511, 263, 543, 287, 595, 305, 635, 329, 671, 357, 729, 373 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Diagonal sums of A106476.

LINKS

Table of n, a(n) for n=0..59.

FORMULA

a(n)=sum{k=0..floor(n/2), phi(n-2k+1)}

CROSSREFS

Sequence in context: A114753 A079316 A106481 * A098043 A324866 A290673

Adjacent sequences:  A106474 A106475 A106476 * A106478 A106479 A106480

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 03 2005

STATUS

approved

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Last modified July 28 10:51 EDT 2021. Contains 346326 sequences. (Running on oeis4.)