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!)
A102806 Numbers that are not the sum of distinct tetrahedral numbers. 7
2, 3, 6, 7, 8, 9, 12, 13, 16, 17, 18, 19, 22, 23, 26, 27, 28, 29, 32, 33, 37, 38, 41, 42, 43, 44, 47, 48, 51, 52, 53, 54, 58, 62, 63, 64, 68, 72, 73, 74, 75, 78, 79, 82, 83, 93, 97, 100, 103, 107, 110, 113, 117, 127, 128, 132, 136, 137, 138, 142, 146, 147, 148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The b-file contains all the members of the sequence.  See link. - Robert Israel, Dec 29 2019

LINKS

Robert Israel, Table of n, a(n) for n = 1..112

Robert Israel, Proof that the b-file is full

MAPLE

N:= 100000: # to test all n <= N

ft:= t -> t*(t+1)*(t+2)/6:

tets:= map(ft, [$1..floor((6*N)^(1/3))]):

f:= proc(n, tmax) option remember;

   local res, s;

   if member(n, tets) and n < tmax then return false fi;

   for s in tets while s < min(n, tmax) do

     if not procname(n-s, s) then return false fi

   od;

     true

end proc:

select(f, [$1..N], infinity); # Robert Israel, Dec 29 2019

CROSSREFS

Cf. A000292, A104246, A102795, etc.

Sequence in context: A037460 A285134 A161824 * A275884 A003605 A132188

Adjacent sequences:  A102803 A102804 A102805 * A102807 A102808 A102809

KEYWORD

nonn,fini,full

AUTHOR

Jud McCranie, Feb 26 2005

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 3 13:15 EST 2021. Contains 341762 sequences. (Running on oeis4.)