1,2

a(n) = A001222(A062006(n)).

Dario Alpern, Factorization using the Elliptic Curve Method.

A000040(10)^10+1=29^10+1=420707233300202=2*421*1061*470925821,

therefore a(10)=4 and A069464(10)=4.

Cf. A069462, A069464.

Sequence in context: A074075 A004020 A143235 this_sequence A047947 A018838 A116982

Adjacent sequences: A069462 A069463 A069464 this_sequence A069466 A069467 A069468

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 24 2002

More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), May 21 2004