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Old 2021-08-08, 06:13   #5
sweety439
 
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"99(4^34019)99 palind"
Nov 2016
(P^81993)SZ base 36

57608 Posts
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It can be easily proven that there are eight k-values which have A001221((k-1)*k*(k+1)) < 4:

2, 3, 4, 5, 7, 8, 9, 17
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