131462

Appears in sequences

• McKay-Thompson series of class 27b for the Monster group.at n=43A058601
• The positions of ones in the reversed binary expansion of n have integer mean and integer geometric mean.at n=27A327368
• a(n) is the smallest number which can be represented as the sum of four distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.at n=33A374274