A152984 - OEIS

A152984

Absolute values of A152864.

1, 2, 3, 3, 5, 3, 7, 4, 7, 5, 11, 1, 13, 7, 9, 5, 17, 2, 19, 3, 13, 11, 23, 5, 21, 13, 17, 5, 29, 5, 31, 6, 21, 17, 25, 11, 37, 19, 25, 3, 41, 5, 43, 9, 17, 23, 47, 19, 43, 12, 33, 11, 53, 5, 41, 1, 37, 29, 59, 37, 61, 31, 27, 7, 49, 5, 67, 15, 45, 3, 71, 40, 73, 37, 31, 17, 61, 5, 79, 17

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..80.

MAPLE

A152864 := proc(n) 2*n-numtheory[sigma](n)+numtheory[tau](n)-1 ; end: A152984 := proc(n) abs(A152864(n)) ; end: for n from 1 to 120 do printf("%d, ", A152984(n)) ; od: # R. J. Mathar, Jan 22 2009

CROSSREFS

Cf. A152864.

Sequence in context: A066858 A333496 A152864 * A177980 A215405 A064921

Adjacent sequences: A152981 A152982 A152983 * A152985 A152986 A152987

KEYWORD

nonn

AUTHOR

Omar E. Pol, Dec 19 2008

EXTENSIONS

Few more terms from R. J. Mathar, Jan 22 2009

STATUS

approved