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

1,1

Links

Table of n, a(n) for n=1..17.

Prog

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

Crossrefs

Sequence in context: A284988 A056488 A031042 * A031094 A007339 A363621

Adjacent sequences: A064428 A064429 A064430 * A064432 A064433 A064434

Keyword

more,nonn

Author

Jason Earls, Sep 30 2001

Extensions

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

Status

approved