A259261 Fixed points in A073673.

1, 2, 3, 13, 39, 55, 527, 776, 910, 942

Offset: 1

Author

Derek Orr, Jun 22 2015

Keywords

• nonn
• more
• hard

Comments

Numbers k such that A073673(k) = k.

a(8) > 750. - R. J. Mathar, Jul 14 2015

Crossrefs

Cf. A073673.

Programs

PARI

v=[1];n=1;print1(1,", ");while(#v<300,s=1+n*prod(i=1,#v,v[i]);if(ispseudoprime(s)&&!vecsearch(vecsort(v),n),v=concat(v,n);if(n==#v,print1(n,", "));n=0);n++)

Extensions

a(8)-a(10) from Michael S. Branicky, May 19 2023