A222712 Record values of gcd(sigma(n), phi(n)) (A009223).

1, 2, 4, 6, 8, 24, 48, 72, 120, 192, 240, 336, 720, 960, 1440, 1872, 2016, 2880, 3360, 4032, 5760, 6720, 6912, 7392, 8640, 10080, 17280, 20160, 34560, 40320, 44352, 60480, 69120, 74880, 95040, 96768, 100800, 120960, 134784, 201600, 241920, 322560, 354816, 411840, 483840

Offset: 1

Author

Phil Carmody, Mar 01 2013

Keywords

• nonn

Comments

RECORDS transform of A009223.

Links

• Donovan Johnson, Table of n, a(n) for n = 1..500
• N. J. A. Sloane, Transforms (The RECORDS transform returns both the high-water marks and the places where they occur).

Crossrefs

Cf. A009223, A222711 (indexes where these records are attained).

Programs

PARI

mg=0;for(x=1,1000000,g=A009223(x);if(g>mg,print1(g", ");mg=g))