16 lines
427 B
Bash
16 lines
427 B
Bash
#!/usr/bin/env bash
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numbers=(627615 39390 588225 393900588225 55)
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declare root
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for number in "${numbers[@]}"; do
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declare -i iterations
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root="${number}"
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while [[ "${#root}" -ne 1 ]]; do
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root="$(( $(fold -w1 <<<"${root}" | xargs | sed 's/ /+/g') ))"
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iterations+=1
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done
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echo -e "${number} has additive persistence ${iterations} and digital root ${root}"
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unset iterations
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done | column -t
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