A387221 Even terms in A002181.

33817088, 67634176, 135268352, 270536704, 541073408, 1082146816, 2164293632, 4328587264, 8589934592, 11734529536, 17179869184, 23469059072, 34359738368, 46938118144, 68719476736, 83764926976, 93876236288, 137438953472, 161882400256, 162288205312, 167529853952, 229246039552, 230869259776, 231883772416, 239391165952, 245072436736

Offset

1,1

Comments

Terms in A002181 are the least number k such that phi(k) = m, where m runs through the values (A002202) taken by phi, where phi is Euler's totient Function (A000010).

References

R. K. Guy, Unsolved Problems in Number Theory, 3rd ed., B39.

Links

Table of n, a(n) for n=1..26.

Crossrefs

Intersection of A002181 and A005843.

Cf. A000010, A002202.

Sequence in context: A246108 A184984 A143511 * A178106 A205943 A232636

Adjacent sequences: A387218 A387219 A387220 * A387222 A387223 A387224

Keyword

nonn

Author

Jud McCranie, Nov 23 2025

Status

approved