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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A226101 Smallest number k such that prime(n) divides the n-th divisor of k. 0
3, 10, 14, 44, 52, 102, 114, 276, 348, 372, 444, 984, 1032, 1128, 1272, 2124, 2196, 3216, 3408, 4380, 4740, 4980, 5340, 11640, 12120, 12360, 12840, 13080, 13560, 15240, 15720, 24660, 25020, 26820, 27180, 37680, 39120, 40080, 41520, 64440, 65160, 68760, 69480 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..44.

EXAMPLE

a(9) = 276 because the divisors of 276 are {1, 2, 3, 4, 6, 12, 23, 46, 69, 92, 138, 276}, and prime(9) = 23, the 9th divisor of 276 is 69 and 23 | 69.

MATHEMATICA

nn = 45; t = Table[0, {nn}]; found = 1; n = 2; While[found < nn, n++; d = Divisors[n]; Do[If[i <= nn && Mod[d[[i]], Prime[i]]==0 && t[[i]] == 0, t[[i]] = n; found++], {i, Length[d]}]]; Rest[t] (* Program from T. D. Noe, adapted for this sequence (see A221647) *)

CROSSREFS

Cf. A000040, A027750, A221647.

Sequence in context: A128930 A328091 A048852 * A141463 A134102 A173600

Adjacent sequences:  A226098 A226099 A226100 * A226102 A226103 A226104

KEYWORD

nonn

AUTHOR

Michel Lagneau, May 26 2013

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 17 06:16 EDT 2021. Contains 347478 sequences. (Running on oeis4.)