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

1,1

Links

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

Formula

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

Crossrefs

Cf. A020639, A097942.

Sequence in context: A323704 A272202 A244609 * A113222 A366671 A060444

Adjacent sequences: A209192 A209193 A209194 * A209196 A209197 A209198

Keyword

nonn

Author

N. J. A. Sloane, Mar 05 2012

Extensions

More terms from Amiram Eldar, Jul 08 2019

Status

approved