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A094410
Numbers k that divide Fibonacci(k-1) but do not divide Fibonacci(k) - 1.
2
442, 1891, 6601, 8149, 13981, 17119, 17711, 30889, 40501, 52701, 68101, 78409, 88601, 88831, 115231, 138601, 145351, 150121, 153781, 191351, 199801, 218791, 265881, 266071, 316561, 332949, 342271, 348517, 407353, 453151, 456301, 464101
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[50000], ! Mod[Fibonacci[ # ] - 1, # ] == 0 && Mod[Fibonacci[ # - 1], # ] == 0 &]
PROG
(PARI) fibmod(n, m)=(Mod([0, 1; 1, 1], m)^n*[0; 1])[1, 1]
is(n)=fibmod(n-1, n)==0 && fibmod(n, n)!=1 \\ Charles R Greathouse IV, Nov 04 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric Rowland, May 01 2004
EXTENSIONS
More terms from David Wasserman, May 08 2007
STATUS
approved