54626

Appears in sequences

• Numbers n such that n | 11^n + 9^n + 7^n + 5^n + 3^n + 1.at n=33A057832
• Consider a room of size r X s where rs = 2n and 1 <= r, 1 <= s; count ways to arrange n Tatami mats in room; a(n) = total number of ways for all choices of r and s. Two arrangements are distinguished if one is a rotation or reflection of the other.at n=26A067925
• Pierce expansion of 2/Pi.at n=10A154956
• Pentagonal numbers which are the arithmetic mean of two consecutive primes.at n=23A234531
• Number of ordered unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 9.at n=30A244538
• Irregular table read by rows: n-th row lists the 9 n-gonal numbers of a 3 X 3 semimagic square with the smallest magic sum. The terms of each row are arranged in the manner shown in A261816.at n=19A265141
• a(n) = n^4/6 - 2*n^3/3 - n^2/6 + 5*n/3 + 1.at n=24A299198
• Pentagonal numbers which are products of four distinct primes.at n=31A381919