A279541 Indices of records in A192013: Sum_{d|n} Kronecker(-6, d).

1, 5, 25, 35, 175, 385, 1225, 1925, 9625, 13475, 48125, 55825, 148225, 279125, 390775, 1395625, 1730575, 4298525, 8652875, 12114025, 43264375, 60570125, 133254275, 302850625, 423990875, 642043325, 2119954375

Offset: 1

Author

Charles R Greathouse IV, Dec 14 2016

Keywords

• nonn

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..400

Crossrefs

Cf. A192013, A279542, A109017.

Programs

PARI

smooth(P:vec, lim)=my(v=List([1]), nxt=vector(#P, i, 1), indx, t); while(1, t=vecmin(vector(#P, i, v[nxt[i]]*P[i]), &indx); if(t>lim, break); if(t>v[#v], listput(v, t)); nxt[indx]++); Vec(v);
ok(p)=p=p%24; p==1 || p==5 || p==7 || p==11;
A192013(n)=sumdivmult(n, d, kronecker(-6, d));
list(lim)=my(u=List([1]),v=[5],r,t); forprime(p=7,, if(ok(p), if(v[#v]*p>lim, break); v=concat(v, v[#v]*p))); v=smooth(v,lim); for(i=2,#v, t=A192013(v[i]); if(t>r, r=t; listput(u,v[i]))); Vec(u)