27722

Appears in sequences

• Product of a prime and the previous number.at n=38A036689
• Numbers of the form 12*k + 2 with nonempty inverse totient set.at n=10A063668
• Deficient oblong numbers.at n=29A077804
• a(n) = smallest k such that (10^k-1)/9 == 0 mod prime(n)^2, or 0 if no such k exists.at n=38A087094
• Squarefree oblong (pronic) numbers having an odd number of prime factors.at n=23A098827
• Indices of prime numbers in A014260.at n=19A101762
• Smallest k > 2 such that 2|k, 3|k+1, 4|k+2,..., n|k+n-2.at n=9A174554
• Smallest k > 2 such that 2|k, 3|k+1, 4|k+2,..., n|k+n-2.at n=10A174554
• a(n) = (9*n+4)*(9*n+5).at n=18A177073
• Numbers m such that gcd(A001008(m), m) > 1, in increasing order.at n=39A256102
• Oblong numbers n such that n - 1 and n + 1 are both semiprime.at n=29A276565
• Numbers n such that 2 * (1^n + 2^n + 3^n + ... + n^n) is not 0 (mod n), but 2 * (1^d + 2^d + 3^d + ... + d^d) is 0 (mod d) for each other d | n.at n=17A280187
• Numbers with digits 2 and 7 only.at n=42A284921
• Multiplicative order of 5 (mod p^2), where p = prime(n), or 0 if 5 and p are not coprime.at n=38A305331
• a(n) = Sum_{k=1..n} k^3 * tau(k), where tau is A000005.at n=12A320895
• Primitive terms of A108569.at n=22A346277
• Record values in A377059.at n=44A378029
• a(n) is the area of the largest rectangle that can be formed from n sticks whose lengths are 1, 2, ..., n.at n=36A381769