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A058011 Consider the sequence {b(m)} of nonprimes; sequence gives values of m where gcd{m, b(m)} increases. 2
1, 4, 6, 8, 27, 30, 33, 96, 100, 120, 330, 335, 340, 350, 355, 360, 1008, 1080, 1092, 1116, 1122, 1128, 1134, 3059, 3066, 3073, 3080, 3087, 3094, 8408, 8424, 8440, 8456, 8464, 8472, 23526, 23535, 24300, 64540, 64580, 64610, 64620, 64650, 64690, 64700 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..44.

EXAMPLE

a(4) = 8 because eight is the fourth nonprime number and GCD(4,8) > GCD(3,6).

MATHEMATICA

r=0; Do[a = GCD[n, n - PrimePi[n] ]; If[a > r, r = a; Print[n]], {n, 1, 10^5} ]

CROSSREFS

Cf. A058012. Apart from initial term same as A057809.

Sequence in context: A019160 A126233 A059889 * A278374 A300658 A089330

Adjacent sequences:  A058008 A058009 A058010 * A058012 A058013 A058014

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Nov 13 2000

STATUS

approved

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Last modified June 20 19:36 EDT 2019. Contains 324234 sequences. (Running on oeis4.)