115843

Appears in sequences

• Quasi-Carmichael numbers to base 3: squarefree composites n such that prime p|n ==> p-3|n-3.at n=18A029560
• Quasi-Carmichael numbers to base -5: squarefree composites n such that prime p|n ==> p+5|n+5.at n=19A029565
• Quasi-Carmichael numbers to at least one negative base and at least one positive base.at n=21A257759
• Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= seven.at n=10A287257