A123195 Numbers n such that A065507[n] = n.

5, 7, 17, 59

Offset: 1

Author

Alexander Adamchuk, Oct 04 2006

Keywords

• hard
• more
• nonn

Comments

A065507[n] is the smallest prime q such that (p^q+1)/(p+1) is a prime, where p = Prime(n).

Examples

			A065507[n] begins {3, 3, 5, 3, 5, 3, 7, 17, 11, 7, 109, 5, 17, 5, 5, 21943, 17,...}.
Thus
a(1) = 5 because A065507[5] = 5,
a(2) = 7 because A065507[7] = 7,
a(3) = 17 because A065507[17] = 17.
		

Crossrefs

Cf. A065507.