74563

Appears in sequences

• Strong pseudoprimes to base 6.at n=21A020232
• Strong pseudoprimes to base 96.at n=27A020322
• Smallest product of two distinct primes of the form n*k+1.at n=42A194265
• Heptagonal numbers (A000566) that are semiprimes (A001358).at n=27A259676
• Heptagonal numbers (A000566) in which parity of digits alternates.at n=20A297646
• Decompose the multiplicative group of integers modulo N as a product of cyclic groups C_{k_1} x C_{k_2} x ... x C_{k_m}, where k_i divides k_j for i < j, then a(n) is the smallest N such that the product contains a copy of C_{2n}.at n=42A302099
• a(n) is the smallest k such that the p-rank of (Z/kZ)* is 2, where p = prime(n) and (Z/kZ)* is the multiplicative group of integers modulo n.at n=13A307434
• Heptagonal numbers (A000566) with prime indices (A000040).at n=39A346494