26533

Appears in sequences

• Positive integers k such that k divides 14^k - 1.at n=5A014956
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 19.at n=8A031607
• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 2.at n=15A049937
• Crystal ball sequence for the A2 x A2 lattice.at n=11A143008
• Product between n-th prime and next perfect square.at n=36A229497
• Number of partitions of n such that some part is a sum of two other parts.at n=39A237113
• S_9 sequence in partition of integers > 1 described in A240521.at n=43A240536
• a(n) is the first composite number having the same base-n digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).at n=24A278981
• a(n) is the first composite number having the same base-(2n) digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).at n=12A281189
• a(n) is the smallest composite number having the same base-n digits (both type and quantity) as its prime factors (with multiplicity).at n=24A281336
• Number of n X 2 0..1 arrays with every element equal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero.at n=15A297980
• Numbers n such that the multiplicative group of integers modulo n is isomorphic to C_m X C_m, m > 1.at n=10A305236
• Odd terms in A305236.at n=4A307527
• a(n) = n^2 - n^3 + n^4.at n=13A309372
• Numbers k such that 6*k + 1 is a prime that can be written as p*q + 2, with p and q being consecutive primes.at n=14A342564
• Primitive terms of A359563: terms of A359563 with no proper divisor in A359563.at n=40A359564
• Let D(k) = {d(k,i)}, i = 1,2,...,q be the set of q divisors of an integer k. a(n) is the smallest number k such that there exist exactly n distinct integers M, 1 < M < k, where each set D(k) mod M is a multiplicative group.at n=36A379645
• Numbers whose sum of prime divisors equals the sum of square divisors.at n=19A390397