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A098991 Numbers n where A098035(n)=0. 0
5, 9, 13, 15, 21, 27, 33, 35, 37, 39, 50, 55, 57, 61, 65, 73, 91, 93, 95, 111, 114, 115, 121, 122, 133, 141, 143, 145, 147, 155, 157, 170, 177, 183, 185, 189, 193, 195, 201, 205, 209, 213, 215, 217, 219, 231, 235, 247, 253, 259, 261, 277, 285, 295, 299, 301, 313 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

Sum_{k|n} mu(k+1), where mu() is Moebius function.

MATHEMATICA

f[n_] := Plus @@ MoebiusMu[Divisors[n] + 1]; Select[ Range[319], f[ # ] == 0 &]

CROSSREFS

Cf. A098035.

Sequence in context: A194371 A062976 A080580 * A116616 A080590 A190696

Adjacent sequences:  A098988 A098989 A098990 * A098992 A098993 A098994

KEYWORD

nonn

AUTHOR

Leroy Quet and Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 05 2004

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Last modified February 14 07:14 EST 2012. Contains 205586 sequences.