64714

Appears in sequences

• 9-gonal (or enneagonal) pyramidal numbers: a(n) = n*(n+1)*(7*n-4)/6.at n=38A007584
• Numbers k such that 50*R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=10A056685
• Number of 4-block ordered bicoverings of an unlabeled n-set.at n=21A060091
• Group the natural numbers such that the n-th group sum is divisible by prime(n): (1, 2, 3), (4, 5), (6, 7, 8, 9), (10, 11), (12, 13, 14, 15, 16, 17, 18, 19, 20, 21), ... Sequence contains the sum of the terms in the n-th group.at n=31A086491
• Number of n X 4 binary arrays without the pattern 0 1 diagonally or vertically.at n=29A188838
• Even 9-gonal (nonagonal) pyramidal numbers.at n=27A218329
• Number of (binary) max-heaps on n elements from the set {0,1} containing exactly ten 0's.at n=22A326511
• Multiply each term by 3 and erase the rightmost digit of the result: this leaves the sequence unchanged.at n=9A365987