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A011778 Numbers k where A011776(k) grows. 4
2, 6, 12, 24, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 480, 630, 672, 720, 1080, 1120, 1260, 1344, 1440, 1890, 2016, 2160, 2240, 2520, 2880, 3024, 3360, 3780, 4032, 4320, 5040, 6048 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Equivalently, 2 along with numbers A092427(j) where A092427(j) > A092427(j-1), for j > 0. - Derek Orr, Apr 16 2015
Is 45 the only odd number in this sequence? - Derek Orr, Apr 16 2015
a(184) = 212837625 and a(311) = 638512875 are the only other odd terms < 10^11. - Charlie Neder, Jan 27 2019
REFERENCES
Ivan Niven, Herbert S. Zuckerman and Hugh L. Montgomery, An Introduction to the Theory Of Numbers, Fifth Edition, Wiley NY 1991.
J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 251.
LINKS
Charlie Neder, Table of n, a(n) for n = 1..697 (terms < 10^11; first 100 terms from T. D. Noe)
FORMULA
a(n) = A061769(n) + 1.
a(n) = A092427(A061770(n)). - Derek Orr, Apr 16 2015
CROSSREFS
Sequence in context: A137895 A194096 A099993 * A067718 A210594 A307252
KEYWORD
nonn,nice,easy
AUTHOR
EXTENSIONS
Corrected by Vladeta Jovovic, Dec 01 2002
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)