A093871 a(n) is the n-th prime = -1 (mod n).

2, 5, 11, 19, 89, 41, 181, 127, 251, 199, 571, 227, 1013, 433, 599, 751, 2039, 593, 2089, 859, 1637, 1429, 4001, 1103, 4049, 2053, 3779, 2267, 6263, 1499, 6571, 3583, 5279, 3943, 6089, 2879, 11321, 4597, 7331, 4919, 15497, 3779, 15307, 6599, 8009, 7681

Offset: 1

Author

Amarnath Murthy, Apr 20 2004

Keywords

• nonn

Comments

Main diagonal of A093870.

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A077317, A038700, A093870.

Programs

Maple

f:= proc(n) local p,count;
  count:= 0;
  for p from n-1 by n do
    if isprime(p) then
       count:= count+1;
       if count = n then return p fi
    fi
  od;
end proc:
map(f, [$1..100]); # Robert Israel, Nov 08 2019

Extensions

Edited and extended by Franklin T. Adams-Watters, Aug 29 2006