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A065745 Sum of squares and twice squares dividing n. 0
1, 3, 1, 7, 1, 3, 1, 15, 10, 3, 1, 7, 1, 3, 1, 31, 1, 30, 1, 7, 1, 3, 1, 15, 26, 3, 10, 7, 1, 3, 1, 63, 1, 3, 1, 70, 1, 3, 1, 15, 1, 3, 1, 7, 10, 3, 1, 31, 50, 78, 1, 7, 1, 30, 1, 15, 1, 3, 1, 7, 1, 3, 10, 127, 1, 3, 1, 7, 1, 3, 1, 150, 1, 3, 26, 7, 1, 3, 1, 31, 91, 3, 1, 7, 1, 3, 1, 15, 1, 30, 1 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Matthew M. Conroy, Home page (listed instead of email address)

FORMULA

Multiplicative with a(2^e)=2^(e+1)-1, a(p^e)=(p^(e+2)-1)/(p-1)/(p+1) for odd p and even e and a(p^e)=(p^(e+1)-1)/(p-1)/(p+1) for odd p and odd e.

CROSSREFS

Cf. A065704, A035316.

Sequence in context: A112132 A053381 A038712 * A117677 A038870 A186428

Adjacent sequences:  A065742 A065743 A065744 * A065746 A065747 A065748

KEYWORD

mult,nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 04 2001

EXTENSIONS

More terms from Matthew M. Conroy, Jan 19 2002

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Last modified February 17 02:31 EST 2012. Contains 205978 sequences.