A209195 Smallest prime factor of the n-th highly totient number (A097942(n)) plus 1.

2, 3, 5, 3, 13, 5, 7, 73, 5, 241, 433, 13, 577, 7, 1153, 11, 43, 29, 7, 8641, 41, 11, 7, 30241, 17, 61, 47, 31, 13, 11, 103681, 73, 161281, 13, 7, 241921, 19, 41, 293, 11, 17, 1451521, 31, 2177281, 83, 2903041, 11, 4354561, 109, 5806081, 13, 8709121, 9676801

Offset: 1

Author

N. J. A. Sloane, Mar 05 2012

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..109 (calculated from the b-file at A097942)

Crossrefs

Cf. A020639, A097942.

Formula

a(n) = A020639(A097942(n) + 1). - Amiram Eldar, Jul 08 2019

Extensions

More terms from Amiram Eldar, Jul 08 2019