75855

Appears in sequences

• Odd triangular numbers with prime indices.at n=36A034954
• Triangular numbers composed of digits {5,7,8}.at n=5A119224
• Triangular numbers p*(p+1)/2 with p prime such that 1+(number of prime factors of p+1) is prime.at n=32A144549
• a(n) = 9^n + 7^n - 1.at n=5A155656
• a(n) = 1*3*5 + 3*5*7 + 5*7*9 + ... (n terms).at n=13A196506
• Number of unordered pairs of distinct strict integer partitions of n.at n=32A366132
• Hexagonal numbers that are products of exactly four distinct primes.at n=34A381920