id:A112456 - OEIS Search Results

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Least triangular number divisible by n-th prime.

+0
2

6, 3, 10, 21, 55, 78, 136, 171, 253, 406, 465, 666, 820, 903, 1081, 1378, 1711, 1830, 2211, 2485, 2628, 3081, 3403, 3916, 4656, 5050, 5253, 5671, 5886, 6328, 8001, 8515, 9316, 9591, 11026, 11325, 12246, 13203, 13861, 14878, 15931, 16290 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Essentially the same as A008837; only the first terms differ.`
	PROGRAM	`(PARI) T(n) = n*(n+1)/2 for(n=1, 100, p=prime(n); tr=1; while(T(tr)%p<>0, tr++); print1(T(tr), ", "))`
	CROSSREFS	`Cf. A000217 (triangular numbers), A008837 (p(p-1)/2 for p prime).` `Sequence in context: A037905 A154465 A066070 this_sequence A060534 A060445 A131894` `Adjacent sequences: A112453 A112454 A112455 this_sequence A112457 A112458 A112459`
	KEYWORD	`nonn`
	AUTHOR	`Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 06 2005`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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