id:A137281 - OEIS Search Results

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Numbers n such that T(n) is not divisible by T(i), 1<i<n, where T(n)=nth triangular number A000217.

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4, 7, 10, 13, 16, 22, 25, 28, 31, 34, 37, 43, 46, 49, 52, 58, 61, 67, 70, 73, 76, 82, 85, 88, 94, 97, 103, 106, 118, 121, 127, 130, 133, 136, 142, 145, 148, 151, 157, 163, 166, 169, 172, 178, 187, 190, 193, 196, 202, 205, 208, 211, 214, 217, 226, 229, 232, 238, 241 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`T(4)=10 is not divisible by lesser T's 3, 6;` `T(7)=28 is not divisible by lesser T's 3, 6, 10, 15, 21.`
	CROSSREFS	`Cf. A000217.` `Adjacent sequences: A137278 A137279 A137280 this_sequence A137282 A137283 A137284` `Sequence in context: A143456 A090852 A090955 this_sequence A134027 A143455 A087065`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Mar 14 2008`

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Last modified January 7 17:35 EST 2009. Contains 152824 sequences.

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