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A013930 Sum of first a(n) squarefrees is squarefree. 3
1, 2, 3, 4, 5, 7, 9, 11, 13, 15, 17, 19, 20, 23, 25, 26, 27, 29, 32, 34, 37, 40, 41, 42, 43, 44, 46, 47, 49, 50, 51, 53, 54, 56, 58, 60, 61, 63, 64, 65, 69, 70, 71, 74, 76, 77, 79, 80, 81, 82, 83, 84, 86, 88, 89, 90, 92, 94, 95, 96, 98, 100, 102, 103, 104, 106, 107, 108, 110, 111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..70.

CROSSREFS

Cf. A005117, A013931, A013932.

Sequence in context: A064005 A316268 A026285 * A004281 A004276 A033057

Adjacent sequences:  A013927 A013928 A013929 * A013931 A013932 A013933

KEYWORD

nonn

AUTHOR

Henri Lifchitz

EXTENSIONS

More terms from David W. Wilson

STATUS

approved

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Last modified November 16 21:37 EST 2018. Contains 317275 sequences. (Running on oeis4.)