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A092679
Numbers k such that 3*2^k has only one anti-divisor.
2
OFFSET
1,3
COMMENTS
Next term should be greater than 1000.
See A066272 for definition of anti-divisor.
FORMULA
A092680(n) = 3*2^a(n).
PROG
(Python)
A092679 = [i for i, n in enumerate(map(lambda x:3*2**x, range(20))) if len([d for d in range(2, n, 2) if n%d and not 2*n%d]+[d for d in range(3, n, 2) if n%d and 2*n%d in [d-1, 1]])==1] # Chai Wah Wu, Aug 09 2014
CROSSREFS
Sequence in context: A341436 A263906 A160739 * A277534 A090592 A377618
KEYWORD
nonn,hard,more
AUTHOR
Lior Manor, Mar 03 2004
STATUS
approved