The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A244576 Sum of all proper divisors of all positive integers <= prime(n). 3
 0, 0, 2, 7, 23, 38, 69, 89, 133, 227, 268, 397, 483, 536, 632, 821, 1018, 1125, 1355, 1511, 1633, 1890, 2077, 2406, 2906, 3150, 3263, 3509, 3680, 3960, 5026, 5319, 5854, 6003, 6909, 7130, 7761, 8345, 8681, 9381, 9986, 10351, 11456, 11771, 12212, 12481, 14128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Also sum of all proper divisors of all positive integers <= prime(n)-1. Also zero together with the numbers that are repeated in A244049. LINKS FORMULA a(n) = A244049(A000040(n)-1) = A244049(A000040(n)). PROG (PARI) a(n) = sum(i=2, prime(n), sigma(i)-i-1); \\ Michel Marcus, Sep 29 2014 CROSSREFS Cf. A000040, A000203, A048050, A244049, A244578, A244583. Sequence in context: A106020 A248602 A045383 * A089176 A049232 A100917 Adjacent sequences:  A244573 A244574 A244575 * A244577 A244578 A244579 KEYWORD nonn AUTHOR Omar E. Pol, Jun 30 2014 EXTENSIONS More terms from Michel Marcus, Sep 29 2014 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 14 01:55 EDT 2020. Contains 336476 sequences. (Running on oeis4.)