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

1,1

Links

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

Formula

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

Example

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.

Crossrefs

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

Sequence in context: A221597 A159763 A100164 * A363531 A224041 A188839

Adjacent sequences: A048188 A048189 A048190 * A048192 A048193 A048194

Keyword

nonn

Author

Naohiro Nomoto

Extensions

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

Status

approved