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A161462 Final digit of sum of all the natural numbers from n to 2*n-1. +0
1
1, 5, 2, 2, 5, 1, 0, 2, 7, 5, 6, 0, 7, 7, 0, 6, 5, 7, 2, 0, 1, 5, 2, 2, 5, 1, 0, 2, 7, 5, 6, 0, 7, 7, 0, 6, 5, 7, 2, 0, 1, 5, 2, 2, 5, 1, 0, 2, 7, 5, 6, 0, 7, 7, 0, 6, 5, 7, 2, 0, 1, 5, 2, 2, 5, 1, 0, 2, 7, 5, 6, 0, 7, 7, 0, 6, 5, 7, 2, 0, 1, 5, 2, 2, 5, 1, 0, 2, 7, 5, 6, 0, 7, 7, 0, 6, 5, 7, 2, 0, 1, 5, 2, 2, 5 (list; graph; listen)
OFFSET

1,2

EXAMPLE

If n=1, then a(1)=1. If n=2 and 2+3=5, then a(2)=5. if n=3 and 3+4+5=12, then a(3)=2, etc.

CROSSREFS

Cf. A000027.

Sequence in context: A070962 A090125 A093008 this_sequence A164557 A153842 A125136

Adjacent sequences: A161459 A161460 A161461 this_sequence A161463 A161464 A161465

KEYWORD

nonn,base

AUTHOR

Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jun 10 2009

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.


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