This site is supported by donations to The OEIS Foundation.



Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A280236 Numbers n such that A278981(n) < A278981(m) for all m > n (excluding values of m where A278981(m) = 0). 1
2, 6, 8, 12, 20, 24, 28, 30, 32, 36, 40, 44, 48, 50, 54, 56, 60, 64, 66, 70, 72, 80, 88, 90, 96 (list; graph; refs; listen; history; text; internal format)



It is not necessary to check A278981(m) for all values of m > n (of which there are infinitely many). One need check only values of a(m) where m^2 + m + 1 <= A278981(n), due to the lower bound of A278981(m).

It appears that all members in this sequence are even, although it is possible that some members could be odd.

It appears that, apart from 2, all members in this sequence appear in A280270. If this is the case, all members in this sequence must be even.


Table of n, a(n) for n=1..25.


6 is a member of this sequence as A278981(6) = 57, which is which is less than all the terms in A278981 which succeed it.

One need check only values of a(m) where m^2 + m + 1 <= 57. In this case, only m=7 needs to be checked, and A278981(7) = 906, with 906 >= 57. Thus A278981(6) < A278981(m) for all m > 6.


Cf. A278981, A280270.

Sequence in context: A200568 A162860 A093006 * A177869 A138639 A082473

Adjacent sequences:  A280233 A280234 A280235 * A280237 A280238 A280239




Ely Golden, Dec 29 2016



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 December 6 16:24 EST 2019. Contains 329808 sequences. (Running on oeis4.)