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

1,2

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).

Prog

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

Crossrefs

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

Sequence in context: A219616 A067732 A334679 * A117912 A092047 A057809

Adjacent sequences: A222709 A222710 A222711 * A222713 A222714 A222715

Keyword

nonn

Author

Phil Carmody, Mar 01 2013

Status

approved