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A072690 a(n) = (n - A048760(n)) * (A048761(n) - n). 1
0, 2, 2, 0, 4, 6, 6, 4, 0, 6, 10, 12, 12, 10, 6, 0, 8, 14, 18, 20, 20, 18, 14, 8, 0, 10, 18, 24, 28, 30, 30, 28, 24, 18, 10, 0, 12, 22, 30, 36, 40, 42, 42, 40, 36, 30, 22, 12, 0, 14, 26, 36, 44, 50, 54, 56, 56, 54, 50, 44, 36, 26, 14, 0, 16, 30, 42, 52, 60, 66, 70, 72, 72, 70, 66 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n)=0 iff n is a square.

LINKS

Table of n, a(n) for n=1..75.

FORMULA

a(n) = A053186(n) * (A072689(n) - A053186(n)).

CROSSREFS

a(n) = A053186(n) * A068527(n).

Sequence in context: A168587 A320119 A100240 * A199454 A244130 A180813

Adjacent sequences:  A072687 A072688 A072689 * A072691 A072692 A072693

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 02 2002

STATUS

approved

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Last modified May 28 07:30 EDT 2022. Contains 354112 sequences. (Running on oeis4.)