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A174435 lambda(y)/x, where y an odd squarefree semiprime and x = ord(2,y) the smallest positive integer such that 2^x == 1 mod y (the multiplicative order of 2 mod y). 2
1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 3, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 3, 2, 4, 2, 1, 1, 1, 1, 1, 1, 1, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 2, 1, 4, 3, 1, 2, 1, 1, 9, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 5, 1, 3, 3, 1, 2, 1, 2, 2, 1, 1, 8, 1, 1, 1, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

V. Papadimitriou, Table of n, a(n) for n=1,...,10000.

EXAMPLE

For n=1 the a(1)= 1, as the first odd squarefree semiprime is 15, lambda(15)=4 and ord(2,15)=4

CROSSREFS

Equals lambda(A046388)/ord(2, A046388), or lambda(A046388)/A174240

Sequence in context: A275811 A102855 A124148 * A330749 A294883 A088530

Adjacent sequences:  A174432 A174433 A174434 * A174436 A174437 A174438

KEYWORD

nonn

AUTHOR

Vassilis Papadimitriou, Mar 19 2010

STATUS

approved

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Last modified September 18 06:35 EDT 2020. Contains 337166 sequences. (Running on oeis4.)