A013935 - OEIS

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A013935

a(n) is nonsquarefree and is sum of first k nonsquarefrees for some k.

4, 12, 49, 136, 343, 388, 436, 820, 884, 952, 1024, 1175, 1336, 1420, 1508, 1690, 1884, 2187, 2295, 2523, 2640, 2760, 3256, 3384, 3516, 4516, 4668, 4977, 5463, 5800, 6318, 6858, 7623, 7821, 8225, 8432, 8640, 8852, 9068, 9288, 9512, 10197, 10431, 11392

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

M. F. Hasler, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Accumulate[Select[Range[300], !SquareFreeQ[#]&]], !SquareFreeQ[#]&] (* Harvey P. Dale, Mar 06 2016 *)

PROG

(PARI) A013935(n, list=0 /* set to 1 for list, filename for b-file */ )={ my(s=i=0); for(c=1, n, while(issquarefree(i++) || issquarefree(s+=i), ); list || next; list==1 && print1(s", "); write(list, c" "s)); s} \\ M. F. Hasler, May 01 2009

CROSSREFS

Cf. A013929, A013933, A013934.

Sequence in context: A111930 A335595 A197867 * A149386 A149387 A151473

Adjacent sequences: A013932 A013933 A013934 * A013936 A013937 A013938

KEYWORD

nonn

AUTHOR

Henri Lifchitz

EXTENSIONS

More terms from David W. Wilson

STATUS

approved