A152989 - OEIS

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A152989

Sum of proper divisors minus the number of proper divisors of triangular number A000217(n).

0, 0, 3, 5, 6, 8, 23, 47, 28, 14, 71, 83, 18, 80, 225, 127, 76, 84, 163, 351, 146, 32, 385, 551, 104, 202, 567, 307, 278, 296, 487, 941, 296, 262, 1219, 805, 54, 372, 1549, 933, 476, 498, 631, 1795, 826, 68, 1737, 2221, 534, 946, 1683, 883, 722, 1380, 2469, 2861, 740, 86, 2535 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	LINKS	`B. D. Swan, Table of n, a(n) for n=1,...,10000`
	FORMULA	`a(n)=A001065(A000217(n))-A032741(A000217(n)) = A152770(A000217(n)).`
	CROSSREFS	`Cf. A000005, A000203, A000217, A001065, A032741, A152770.` `Sequence in context: A039014 A102989 A005623 * A195481 A199730 A016612` `Adjacent sequences: A152986 A152987 A152988 * A152990 A152991 A152992`
	KEYWORD	`nonn`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), Dec 20 2008`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.