login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A281591 First differences of A281590. 3
3, 5, 6, 5, 7, 6, 8, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 10, 11, 12, 11, 11, 12, 11, 12, 12, 12, 12, 13, 12, 13, 12, 13, 13, 13, 13, 13, 13, 13, 14, 13, 14, 13, 14, 14, 14, 14, 14, 14, 15, 14, 15, 14, 15, 14, 15, 15, 15, 15, 15, 15, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 1..2611

MATHEMATICA

nmax = 1000; A284896 = Rest[CoefficientList[Series[Product[1/(1 + x^k)^(k^2), {k, 1, nmax}], {x, 0, nmax}], x]]; csign = {1}; Do[If[(A284896[[n]] < 0 && A284896[[n+1]] >= 0) || (A284896[[n]] >= 0 && A284896[[n+1]] < 0), csign = Flatten[{csign, n + 1}]], {n, 1, Length[A284896] - 1}]; Differences[csign]

CROSSREFS

Cf. A284896, A281590.

Sequence in context: A110279 A161435 A224831 * A267884 A077859 A123572

Adjacent sequences:  A281588 A281589 A281590 * A281592 A281593 A281594

KEYWORD

nonn

AUTHOR

Vaclav Kotesovec, Apr 14 2017

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 March 18 19:57 EDT 2019. Contains 321293 sequences. (Running on oeis4.)