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A018821 n is the sum of k nonzero squares for all 2 <= k <= n-14. 1
17, 18, 26, 34, 45, 50, 53, 61, 65, 68, 72, 73, 74, 82, 89, 90, 97, 98, 101, 104, 106, 109, 113, 116, 117, 122, 125, 136, 137, 145, 146, 149, 153, 157, 162, 164, 169, 170, 173, 178, 180, 181, 185, 193, 194, 197, 200, 202, 205, 212, 218, 221, 225, 226, 229, 233, 234, 241 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Every n > 19 is the sum of k nonzero squares for all 6 <= k <= n-14. - Robert Israel, Apr 09 2017

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

Index entries for sequences related to sums of squares

MAPLE

N:= 1000: # to get all terms <= N

A:= {$16..N}:

S:= {seq(i^2, i=1..floor(sqrt(N)))}:

SS:= S:

for k from 2 to 6 do

  SS:= select(`<=`, {seq(seq(s+t, s=S), t=SS)}, N):

  A := select(`<`, A, k+14) union (A intersect SS);

od:

sort(convert(A, list)); # Robert Israel, Apr 09 2017

CROSSREFS

Sequence in context: A295487 A308888 A084379 * A255923 A226673 A151978

Adjacent sequences:  A018818 A018819 A018820 * A018822 A018823 A018824

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified July 27 02:39 EDT 2021. Contains 346302 sequences. (Running on oeis4.)