A020643 - OEIS

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A020643

a(n)-th squarefree is sum of first k squarefrees for some k.

1, 3, 5, 8, 12, 22, 36, 55, 77, 102, 133, 169, 187, 248, 296, 320, 343, 395, 483, 547, 652, 768, 809, 851, 893, 935, 1023, 1065, 1158, 1206, 1256, 1359, 1412, 1522, 1631, 1746, 1805, 1932, 1992, 2057, 2316, 2385, 2454, 2665, 2812, 2887, 3043, 3119, 3199, 3279 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A013930, A013931, A013932.` `Sequence in context: A055606 A147879 A147880 * A131354 A092360 A129141` `Adjacent sequences: A020640 A020641 A020642 * A020644 A020645 A020646`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Renaud Lifchitz (100637.64(AT)CompuServe.COM), David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified February 16 20:14 EST 2012. Contains 205962 sequences.