login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A242393 Records in A187202 by index. 2
1, 3, 5, 7, 11, 13, 17, 19, 23, 29, 30, 42, 90, 132, 150, 156, 168, 240, 360, 420, 756, 924, 960, 1260, 2160, 2520, 4620, 5040, 6720, 7560, 14280, 16380, 18480, 20160, 31680, 35280, 41580, 45360, 50400, 65520, 98280, 110880, 171360, 226800, 249480, 257040, 262080, 277200, 332640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The first nine odd primes are present, and then only (very) abundant numbers.

LINKS

Robert G. Wilson v, Table of n, a(n) for n = 1..106

EXAMPLE

The final or last difference of 30 is 50 = A187202(30). The next higher value is 104 which occurs at 42, A187202(42) = 104.

MATHEMATICA

f[n_] := (dvr = Divisors@ n; Differences[dvr, Length@ dvr - 1][[1]]); k = 1; lst = {}; mx = 0; While[k < 100000001, If[ f@ k > mx, mx = f@ k; Print[{k, mx}]; AppendTo[lst, {k, mx}]]; k++]; Transpose[ lst][[1]]

CROSSREFS

Cf. A187202.

Sequence in context: A176847 A067019 A132106 * A210494 A338483 A318871

Adjacent sequences:  A242390 A242391 A242392 * A242394 A242395 A242396

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, May 12 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 14 21:27 EDT 2021. Contains 345041 sequences. (Running on oeis4.)