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!)
 A257554 Numbers n such that A007954(n) divides n and n divides A007954(n)^2. 3
 1, 2, 3, 4, 5, 6, 7, 8, 9, 36, 128, 175, 384, 735, 1296, 2916, 18432, 34992, 82944, 139968, 442368, 2333772, 4128768, 9289728, 12192768, 13226976, 13395375, 13436928, 27869184, 49787136, 376233984, 429981696, 1269789696, 2633637888, 4161798144, 16728477696, 19999187712, 41479796736, 72236924928 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS There are 66 terms below 10^400 with the largest containing 46 digits. LINKS Max Alekseyev, Table of n, a(n) for n = 1..66 PROG (PARI) for(n=1, 10^6, d=digits(n); p=prod(i=1, #d, d[i]); if(p && n%p==0 && p^2%n==0, print1(n, ", ") )) \\ Derek Orr, Apr 29 2015 CROSSREFS Intersection of A007602 and A128606. Sequence in context: A064154 A316147 A080161 * A270393 A257787 A098771 Adjacent sequences:  A257551 A257552 A257553 * A257555 A257556 A257557 KEYWORD nonn,base AUTHOR Max Alekseyev, Apr 29 2015 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 April 21 02:10 EDT 2021. Contains 343143 sequences. (Running on oeis4.)