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A128466 Primes of the form ((k+1)^k - 1)/k^2 = A060073(k+1). 4
2, 7, 311, 7563707819165039903 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Corresponding numbers k are listed in A127837.
Terms are the primes in A060073.
Next term has 15850 = 1 + floor((4357*log(4358) - 2*log(4357))/log(10)) digits and is too large to include. - M. F. Hasler, May 22 2007
LINKS
FORMULA
a(n) = ((A127837(n) + 1)^A127837(n) - 1) / A127837(n)^2.
MATHEMATICA
Select[Table[((n+1)^n-1)/n^2, {n, 500}], PrimeQ] (* Harvey P. Dale, Apr 30 2011 *)
PROG
(PARI) A128466(n)=A060073(A127837(n)+1) /* see there. --- or: */ forprime(p=1, 10^5, if(ispseudoprime(n=((p+1)^p-1)/p^2), print1(n, ", "))); \\ M. F. Hasler, May 22 2007
CROSSREFS
Sequence in context: A128456 A137666 A137665 * A048122 A144787 A118910
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Mar 09 2007
STATUS
approved

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Last modified March 29 04:59 EDT 2024. Contains 371264 sequences. (Running on oeis4.)