A243356 Numbers n such that n and phi(n) have no common digits.

2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 22, 24, 27, 30, 32, 33, 34, 35, 36, 39, 40, 44, 46, 48, 51, 54, 55, 56, 57, 62, 64, 65, 66, 68, 69, 70, 74, 75, 77, 78, 80, 81, 82, 85, 86, 87, 88, 90, 91, 92, 93, 95, 96, 98, 99, 105, 106, 108, 111, 112

Offset

1,1

Links

Colin Barker, Table of n, a(n) for n = 1..3000

Example

108 is in the sequence because phi(108) = 36, which has no digits in common with 108.

Mathematica

Select[Range[200], Intersection[IntegerDigits[#], IntegerDigits[EulerPhi[#]]]=={}&] (* Harvey P. Dale, Feb 19 2024 *)

Prog

(PARI) s=[]; for(n=1, 300, if(setintersect(vecsort(digits(n), , 8), vecsort(digits(eulerphi(n)), , 8))==[], s=concat(s, n))); s

Crossrefs

Cf. A000010, A082060.

Sequence in context: A178860 A178858 A362710 * A347933 A117296 A096503

Adjacent sequences: A243353 A243354 A243355 * A243357 A243358 A243359

Keyword

nonn,base

Author

Colin Barker, Jun 03 2014

Status

approved