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A119664
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Sign in term (2p +/- 1) for triangular numbers of the form p * (2p +/- 1), where the two factors are both primes.
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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, -1, -1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1
(list; graph; refs; listen; history; internal format)
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