100219domain: NAppears in sequencesQuasi-Carmichael numbers to base -5: squarefree composites n such that prime p|n ==> p+5|n+5.at n=17A029565Number of (n+5)X9 0..1 matrices with each 6X6 subblock idempotent.at n=17A224573Number of parts in all partitions of n with largest multiplicity three.at n=41A320373