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A058542 Trajectory of 16 under map that sends x to 3x - sigma(x). 3
16, 17, 33, 51, 81, 122, 180, -6, -30, -162, -849, -3683, -14889, -67387, -270481, -1083495, -5351733, -23785493, -95779647, -425687333, -1702749333, -7385743647, -33685755741, -156526119063, -703401325293, -3048080581927, -12307998348021, -53348118829343 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..27.

MATHEMATICA

NestList[3#-DivisorSigma[1, #]&, 16, 30] (* Harvey P. Dale, Jun 01 2016 *)

CROSSREFS

Cf. A037159, A058541, A058545.

Sequence in context: A041518 A042195 A041520 * A041516 A041514 A041512

Adjacent sequences:  A058539 A058540 A058541 * A058543 A058544 A058545

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Dec 24 2000

STATUS

approved

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Last modified January 16 21:37 EST 2019. Contains 319206 sequences. (Running on oeis4.)