A181441 a(n) = A114537(n,n), the (n-1)-fold application of the prime function starting with the n-th nonprime.

1, 7, 41, 331, 3001, 42043, 919913, 19734581, 440817757, 12501968177, 435748987787, 19638537755027, 692919372869953, 30634679101122821, 1695313841631390713

Offset: 1

Author

Raul Eduardo Capela Tello Rato (rtrato(AT)yahoo.com), Oct 20 2010

Keywords

• nonn
• more

Comments

Found when generalizing Matula numbers to labeled trees.

Examples

			a(3) = prime(prime(A018252(3))) = prime(prime(6)) = prime(13) = 41.
		

Crossrefs

Cf. A018252, A114537.

Formula

a(n) = prime^(n-1)(A018252(n)) = A114537(n,n).

Extensions

a(9)-a(15) from Robert G. Wilson v, Mar 07 2017