A065374 Smallest k such that f(f(...f(k))) > 1, where f(k) = A065371(k) is iterated n times.

5, 13, 29, 43, 61, 307, 383, 2689, 9209, 14897, 83557, 274679, 598333, 3516973, 11295673, 24104629, 229561369

Offset

1,1

Comments

This sequence contains only prime numbers. - Paul Tek, Jun 10 2013

Links

Table of n, a(n) for n=1..17.

Paul Tek, C++ program for this sequence

Example

a(2) = 13 because A065372(13) = 3 and A065372(i) = 1 for i < 13.
After 10 iterations of A065371 we have a sequence starting with 14896 1's followed by 6, so a(10)= 14897.

Crossrefs

Cf. A065371, A065372, A065373.

Sequence in context: A163251 A247177 A146286 * A130066 A206258 A270106

Adjacent sequences: A065371 A065372 A065373 * A065375 A065376 A065377

Keyword

more,nonn

Author

Reinhard Zumkeller, Nov 02 2001

Extensions

a(14)-a(16) from Paul Tek, Jun 10 2013

a(17) from Sean A. Irvine, Aug 31 2023

Status

approved