The 1970s (pronounced nineteenseventies; shortened to the 70s) was a decade of the Gregorian calendar that began on January 1, 1970, and ended on December 31, 1979.. In the 21st century, historians have increasingly portrayed the 1970s as a pivot of change in world history, focusing especially on the economic upheavals that followed the end of the postwar economic boom.The smallest weird number is 70. Its proper divisors are 1, 2, 5, 7, 10, 14, and 35; these sum to 74, but no subset of these sums to 70. The number 12, for example, is abundant but not weird, because the proper divisors of 12 are 1, 2, 3, 4, and 6, which sum to 16; but 2 + 4 + 6 = 12. The first few weird numbers are.
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