A249016 Indices of records in A055460 (number of primes dividing the squarefree part of n!).

1, 2, 3, 5, 13, 17, 21, 23, 33, 42, 43, 56, 57, 75, 84, 99, 101, 105, 109, 119, 133, 139, 157, 162, 163, 182, 183, 207, 208, 219, 220, 255, 257, 263, 267, 303, 305, 307, 315, 340, 341, 343, 383, 385, 387, 397, 411, 420, 421, 423, 469, 483, 485, 489, 505, 519, 523, 547, 552, 553, 581, 602, 603, 609, 618

Offset: 1

Author

Max Alekseyev, Oct 19 2014

Keywords

• nonn

Links

• Max Alekseyev, Table of n, a(n) for n = 1..38282

Crossrefs

Cf. A249017 (values of records), A055204

Programs

PARI

np=vector(10^6); b=-1; r=0; for(n=1, 10^6, f=factor(n); for(i=1, matsize(f)[1], if(f[i, 2]%2, r += (-1)^np[f[i, 1]]; np[f[i, 1]]=1-np[f[i, 1]]; )); if(r>b, b=r; print1(n, ", ")))