18538

Appears in sequences

• 13 times pentagonal numbers: a(n) = 13*n*(3*n-1)/2.at n=31A153793
• Multiples of 23 whose digit reversal + 1 is also a multiple of 23.at n=31A166393
• Sum of all parts > 1 of all partitions of n.at n=21A194552
• Number of 6 X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 6 X n array.at n=17A220036
• Number of (n+2) X 3 0..1 matrices with each 3 X 3 subblock idempotent.at n=13A224552
• Number of integer partitions of n of even rank.at n=40A340601
• Squarefree numbers k such that k^2 is abundant, and d^2 is nonabundant for any proper divisor d of k.at n=34A381741