A158963 Numbers n such that A160691(n)=12.

2993, 63254, 63792, 82213, 104728, 130811, 135767, 137994, 149813, 156335, 193041, 193776, 199879, 210805, 211672, 223315, 251970, 260321, 262337, 272797, 275037, 282223, 286055, 287700, 288132, 290011, 305784, 308918, 320597, 324168, 346165, 347376, 361103, 372074, 381698

Offset

1,1

Comments

What is the first number n such that A160691(n) is not in the set {1,2,4,6,8,12}?

271532 is the first such number and A160691(271532)=10. - Michel Marcus, Sep 05 2017

Links

Table of n, a(n) for n=1..35.

Mathematica

c[1]=1; c[n_]:=c[n]=(s=Sum[c[k], {k, n-1}]; For[m=1, DivisorSigma[0, m]!=
DivisorSigma[0, s+m], m++ ]; m); Do[If[DivisorSigma[0, c[n]]==12, Print[n]], {n, 210000}]

Crossrefs

Cf. A158964, A160689, A160690, A160691.

Sequence in context: A253955 A253758 A230013 * A178326 A063055 A235754

Adjacent sequences: A158960 A158961 A158962 * A158964 A158965 A158966

Keyword

nonn

Author

Farideh Firoozbakht, May 28 2009

Extensions

More terms from Michel Marcus, Sep 05 2017

Status

approved