This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A162490 #8 Feb 07 2025 14:25:45 %S A162490 17,593,32993,2097593,59604644783353249, %T A162490 43143988327398957279342419750374600193,8589935681, %U A162490 5052785737795758503064406447721934417290878968063369478337 %N A162490 Least prime of the form x^y+y^x with x = A162488(n) > y > 1. %C A162490 Sequences A162488 and A162489 list the corresponding x and y values. %C A162490 Sequence A094133 lists these primes ordered by their size (without multiplicity). See there for more information, links and references. %F A162490 a(n) = A162488(n)^A162489(n) + A162489(n)^A162488(n). %e A162490 The least x such that x^y+y^x is prime for some x>y>1 is A162488(1)=3, for y=A162489(1)=2, yielding the prime a(1) = 9 + 8 = 17. %o A162490 (PARI) for(i=3,999,for(j=2,i-1,isprime(i^j+j^i)||next;print1(i^j+j^i", ");break)) %Y A162490 Cf. A094133, A162486 - A162489. %K A162490 nonn %O A162490 1,1 %A A162490 _M. F. Hasler_, Jul 04 2009