This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A071326 Sum of squares > 1 dividing n. 2
 0, 0, 0, 4, 0, 0, 0, 4, 9, 0, 0, 4, 0, 0, 0, 20, 0, 9, 0, 4, 0, 0, 0, 4, 25, 0, 9, 4, 0, 0, 0, 20, 0, 0, 0, 49, 0, 0, 0, 4, 0, 0, 0, 4, 9, 0, 0, 20, 49, 25, 0, 4, 0, 9, 0, 4, 0, 0, 0, 4, 0, 0, 9, 84, 0, 0, 0, 4, 0, 0, 0, 49, 0, 0, 25, 4, 0, 0, 0, 20, 90, 0, 0, 4, 0, 0, 0, 4, 0, 9, 0, 4, 0, 0, 0, 20, 0, 49, 9, 129 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Antti Karttunen, Table of n, a(n) for n = 1..16384 FORMULA a(n) = A035316(n)-1. Sum_{d|n, d>1} A010052(d). - Antti Karttunen, Nov 17 2017 MATHEMATICA Array[DivisorSum[#, # &, IntegerQ@ Sqrt@ # &] - 1 &, 100] (* Michael De Vlieger, Nov 17 2017 *) PROG (PARI) A071326(n) = sumdiv(n, d, (d>1)*issquare(d)*d); \\ Antti Karttunen, Nov 17 2017 CROSSREFS Cf. A000203, A010052, A071325, A071327. One less than A035316. Sequence in context: A272618 A265397 A071327 * A284103 A151674 A297968 Adjacent sequences:  A071323 A071324 A071325 * A071327 A071328 A071329 KEYWORD nonn AUTHOR Reinhard Zumkeller, May 18 2002 EXTENSIONS More terms from Antti Karttunen, Nov 17 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 15 13:01 EDT 2018. Contains 316236 sequences. (Running on oeis4.)