On tetrahedral numbers.
Harold Simpson (1962)
Bollettino dell'Unione Matematica Italiana
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Harold Simpson (1962)
Bollettino dell'Unione Matematica Italiana
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G. G. Legatos (1966)
Bollettino dell'Unione Matematica Italiana
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A. Mąkowski (1962)
Bollettino dell'Unione Matematica Italiana
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Richard Bellman (1960)
Bollettino dell'Unione Matematica Italiana
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