The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A324529 a(n) = lcm(sigma(n), pod(n)) where sigma(k) = the sum of divisors of k (A000203) and pod(n) = the product of divisors of k (A007955). 5
 1, 6, 12, 56, 30, 36, 56, 960, 351, 900, 132, 12096, 182, 1176, 1800, 31744, 306, 75816, 380, 168000, 14112, 4356, 552, 1658880, 3875, 14196, 29160, 21952, 870, 810000, 992, 2064384, 17424, 31212, 58800, 917070336, 1406, 21660, 85176, 23040000, 1722, 6223392 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA a(n) = pod(n) for numbers n in A145551. a(n) = sigma(n) * pod(n) for numbers n in A014567. EXAMPLE For n=4: a(4) = lcm(sigma(4), pod(4)) = lcm(7, 8) = 56. PROG (Magma) [LCM(SumOfDivisors(n), &*[d: d in Divisors(n)]): n in [1.. 1000]] (PARI) a(n) = my(d=divisors(n)); lcm(vecsum(d), vecprod(d)); \\ Michel Marcus, Mar 05 2019 CROSSREFS Cf. A000005, A000203, A014567, A145551. Sequence in context: A290999 A094060 A341893 * A076722 A322288 A337739 Adjacent sequences: A324526 A324527 A324528 * A324530 A324531 A324532 KEYWORD nonn AUTHOR Jaroslav Krizek, Mar 05 2019 STATUS approved

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

Last modified December 7 17:25 EST 2022. Contains 358668 sequences. (Running on oeis4.)