A097365 Largest prime factor of A096421(n).

2, 2, 3, 3, 11, 7, 5, 7, 5, 43, 1093, 1453, 71, 13, 67, 661, 155191, 103, 2617, 3461, 420929, 1319, 1839833, 129917, 1531, 1316537, 91387, 40841, 30631, 49506559, 1176509, 262069, 14497151, 7489, 1860564731, 1053007, 4557398710937

Offset

3,1

Links

Daniel Suteu, Table of n, a(n) for n = 3..259

Example

A096421(19) = 79457792 = 2^9 * 155191, so a(19) = 155191.

Prog

(PARI) {m=39; v=vector(m); v[1]=1; for(n=2, m, s=0; for(j=1, n-1, if(gcd(j, n)==1, s=s+v[j]*v[n-j])); v[n]=s); for(i=3, m, fac=factor(v[i]); print1(fac[matsize(fac)[1], 1], ", "))}

Crossrefs

Cf. A096421, A097366.

Sequence in context: A095060 A319628 A094117 * A156906 A216245 A180000

Adjacent sequences: A097362 A097363 A097364 * A097366 A097367 A097368

Keyword

nonn

Author

Klaus Brockhaus, Aug 09 2004

Status

approved