Crossword clues for Natural numbers.:ALEPH___-null (the number of natural numbers)POSLike natural numbers: Abbr.OPIATENatural number?INTEGERSNatural numbers.UNITThe first natural numberINTEGERNatural numberPOSLike all natural numbers: Abbr.INTEGERAny natural numberSUBSETPrimes, in relation to natural numbers, e.g.INTEGERNatural whole numberBORONElement with a low atomic number that is not found naturally on EarthFIBONACCISEQUENCENumber series found in patterns in nature, and in order in the starts of 23-, 44-, 55-, 81-, 91- and 114-Across and 15-Down