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A119665
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Sign in the term (2q +/- 1) for triangular numbers of the form q * (2q +/- 1) where both factors are primes (or prime powers).
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0
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-1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1
(list; graph; refs; listen; history; internal format)
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