login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A161600 Nonprime numbers such that TITO(n) = n, where TITO(n) = A161594(n). 8
1, 4, 6, 8, 9, 22, 26, 33, 39, 44, 46, 55, 62, 66, 69, 77, 82, 86, 88, 93, 99, 121, 143, 169, 187, 202, 206, 226, 242, 252, 253, 262, 286, 299, 303, 309, 339, 341, 343, 363, 393, 404, 422, 446, 451, 466, 473, 482, 484, 505, 525, 583, 606, 616, 622, 626, 633, 662, 669, 671, 682, 686 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

T. Khovanova, Turning Numbers Inside Out [From Tanya Khovanova, Jul 07 2009]

MATHEMATICA

reversepower[{n_, k_}] := FromDigits[Reverse[IntegerDigits[n]]]^k; f[n_] := FromDigits[Reverse[IntegerDigits[Times @@ Map[reversepower, FactorInteger[n]]]]]; Select[Range[600], f[#] == # && ! PrimeQ[#] &]

PROG

(Haskell)

a161600 n = a161600_list !! (n-1)

a161600_list = filter ((== 0) . a010051) a161597_list

-- Reinhard Zumkeller, Oct 14 2011

(PARI) is(n)=!isprime(n)&&n==A161594(n) \\ M. F. Hasler, May 11 2015

CROSSREFS

Cf. A010051, A161594; subsequence of A161597.

Sequence in context: A121719 A267509 A162738 * A032350 A078337 A046351

Adjacent sequences:  A161597 A161598 A161599 * A161601 A161602 A161603

KEYWORD

nonn,base

AUTHOR

J. H. Conway & Tanya Khovanova, Jun 14 2009

EXTENSIONS

Edited by N. J. A. Sloane, Jun 23 2009

Offset corrected by Reinhard Zumkeller, Oct 14 2011

Minor edits and more displayed terms from M. F. Hasler, May 11 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 23 20:23 EST 2017. Contains 295141 sequences.