1,1

(PARI) xp1toxp1(n)= { sr=0; forstep(x=2, n, 1, y=(x+1)^x + x^(x-1); if(ispseudoprime(y), print(x" "y" "); sr+= 1.0/y; ) ); print(); print(sr) }

Sequence in context: A047243 A099148 A029787 this_sequence A101471 A137471 A051209

Adjacent sequences: A054459 A054460 A054461 this_sequence A054463 A054464 A054465

nonn

Cino Hilliard (hillcino368(AT)gmail.com), Aug 30 2003