A048191 Let (u1,u2) be successive untouchable numbers such that phi(u1) = phi(u2) = k; sequence gives values of k.

32, 144, 192, 312, 240, 592, 672, 760, 648, 936, 1600, 864, 1560, 1224, 1872, 2160, 2688, 1920, 2088, 1920, 3312, 3732, 3760, 2640, 3984, 4240, 4272, 2880, 4248, 6432, 5976, 5112, 7760, 5280, 7932, 4320, 8968, 9000, 6176, 7680, 10224, 7560, 12072, 12432, 12552

Offset: 1

Author

Naohiro Nomoto

Keywords

• nonn

Examples

			32 is a term since 96 and 120 are successive untouchable numbers and phi(96) = phi(120) = 32.
144 is a term since 292 and 304 are successive untouchable numbers and phi(292) = phi(304) = 144.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..4309 (terms 1..81 from Michel Marcus)

Crossrefs

Cf. A000010, A005114, A048188, A048189, A048190.

Formula

a(n) = A000010(A048189(n)) = A000010(A048190(n)). - Amiram Eldar, Sep 23 2022

Extensions

Offset changed to 1 and more terms from Michel Marcus, Jun 08 2015