id:A020643 - OEIS Search Results

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A020643

a(n)-th square-free is sum of first k square-frees for some k.

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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; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A013930, A013931, A013932.` `Sequence in context: A055606 A147879 A147880 this_sequence A092360 A129141 A097431` `Adjacent sequences: A020640 A020641 A020642 this_sequence 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 November 22 20:51 EST 2009. Contains 167312 sequences.

AT&T Labs Research