OFFSET
1,1
COMMENTS
If we use the commonly accepted convention that 0^0 = 1, then a(0) = 2. - Chai Wah Wu, Jul 22 2019
REFERENCES
C. Stanley Ogilvy and John T. Anderson, Excursions in Number Theory. Dover. New York: 1988. Page 82.
LINKS
FORMULA
a(n) = A055385(2*n). - Michel Marcus, Jul 23 2013
EXAMPLE
8^8 + 1 = 97 * 257 * 673, so a(4) = 97.
MATHEMATICA
Table[With[{k = 2 n}, FactorInteger[k^k + 1]][[1, 1]], {n, 1, 60, 1} (* Vincenzo Librandi, Jul 23 2013 *)
PROG
(PARI) a(n) = factor(n^n + 1)[1, 1] \\ Michel Marcus, Jul 23 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Walter Nissen, Jun 24 2000
STATUS
approved