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A222712 Record values of gcd(sigma(n), phi(n)) (A009223). 2
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 (list; graph; refs; listen; history; text; internal format)
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: A119260 A219616 A067732 * A117912 A092047 A057809

Adjacent sequences:  A222709 A222710 A222711 * A222713 A222714 A222715

KEYWORD

nonn

AUTHOR

Phil Carmody, Mar 01 2013

STATUS

approved

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Last modified November 22 18:55 EST 2019. Contains 329410 sequences. (Running on oeis4.)