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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

Table of n, a(n) for n=1..98.

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

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Last modified July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)