OFFSET
1,1
EXAMPLE
6*tau(6)=24 hence 23 is in the sequence.
PROG
(PARI) lista(nn) = {forprime(p=2, nn, for (n=1, p, if (n*numdiv(n)-1 == p, print1(p, ", "); break; ); ); ); } \\ Michel Marcus, Dec 01 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 13 2003
STATUS
approved