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

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A283078 a(n) = sigma(7*n). 9
 8, 24, 32, 56, 48, 96, 57, 120, 104, 144, 96, 224, 112, 171, 192, 248, 144, 312, 160, 336, 228, 288, 192, 480, 248, 336, 320, 399, 240, 576, 256, 504, 384, 432, 342, 728, 304, 480, 448, 720, 336, 684, 352, 672, 624, 576, 384, 992, 400, 744, 576, 784, 432, 960 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 EXAMPLE For n = 3, the divisors of 3*7 are {1, 3, 7, 21}. Now, 1 + 3 + 7 + 21 = 32. So, a(3) = 32. - Indranil Ghosh, Feb 28 2017 MATHEMATICA Table[DivisorSigma[1, 7n], {n, 1, 54}] (* Indranil Ghosh, Feb 28 2017 *) PROG (PARI) a(n) = sigma(7*n) \\ Indranil Ghosh, Feb 28 2017 CROSSREFS Sigma(k*n): A000203 (k=1), A062731 (k=2), A144613 (k=3), A193553 (k=4), A224613 (k=6), this sequence (k=7). Sequence in context: A044069 A028628 A128690 * A319528 A140403 A108578 Adjacent sequences:  A283075 A283076 A283077 * A283079 A283080 A283081 KEYWORD nonn AUTHOR Seiichi Manyama, Feb 28 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 22 13:41 EST 2020. Contains 331149 sequences. (Running on oeis4.)