A064431 Numbers n such that |A053222(n)| = tau(n).

6, 21, 38, 44, 45, 81, 164, 261, 278, 4388, 9009, 114302, 41623514, 440169957, 19033618221, 175036435525, 341846222877

Offset: 1

Author

Jason Earls, Sep 30 2001

Keywords

• more
• nonn

Programs

PARI

t(n) = abs(sigma(n+1)-sigma(n)) for(n=1,10^6, if(t(n)==numdiv(n),print(n)))

Extensions

a(13)-a(17) from Giovanni Resta, Feb 08 2014