id:A086072 - OEIS Search Results

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Number of 1's in decimal expansion of triangular number n(n+1)/2.

+0
10

0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 2, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 1, 2, 1, 1, 0, 1, 2, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 0 (list; graph; listen)

	OFFSET	`0,19`
	EXAMPLE	`tri(6)=21, so a(6)=1 and tri(1541)=1188111, so a(1541)=5.`
	CROSSREFS	`Cf. 0's A086071, 2's A086073, 3's A086074, 4's A086075, 5's A086076, 6's A086077, 7's A086078, 8's A086079, 9's A086080.` `Sequence in context: A061158 A085979 A127327 this_sequence A086009 A086010 A089198` `Adjacent sequences: A086069 A086070 A086071 this_sequence A086073 A086074 A086075`
	KEYWORD	`base,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 08 2003`

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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