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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A177338 Triangle read by rows: R(n,k)=2^(n-tau(k)) mod n, where tau(.) is the number of divisors of its argument. 0
 0, 0, 1, 1, 2, 2, 0, 0, 0, 2, 1, 3, 3, 4, 3, 2, 4, 4, 2, 4, 4, 1, 4, 4, 2, 4, 1, 4, 0, 0, 0, 0, 0, 0, 0, 0, 4, 2, 2, 1, 2, 5, 2, 5, 1, 2, 6, 6, 8, 6, 4, 6, 4, 8, 4, 1, 6, 6, 3, 6, 7, 6, 7, 3, 7, 6, 8, 4, 4, 8, 4, 4, 4, 4, 8, 4, 4, 4, 1, 7, 7, 10, 7, 5, 7, 5, 10, 5, 7, 11, 7, 2, 8, 8, 4, 8, 2, 8 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS EXAMPLE Triangle begins in row n=1 with columns 1<=k<=n: 0, 0, 1, 1, 2, 2, 0, 0, 0, 2, 1, 3, 3, 4, 3, 2, 4, 4, 2, 4, 4, PROG (PARI) trg(nn) = {for (n= 1, nn, for (k = 1, n, print1(2^(n - numdiv(k)) % n, ", "); ); print(); ); } \\ Michel Marcus, Sep 11 2013 CROSSREFS Cf. A000005, A000079, A062173, A154234, A174875. Sequence in context: A279479 A343630 A318584 * A024158 A054978 A129438 Adjacent sequences:  A177335 A177336 A177337 * A177339 A177340 A177341 KEYWORD nonn,tabl AUTHOR Juri-Stepan Gerasimov, Dec 10 2010 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 July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)