26981

Properties

Appears in sequences

• Number of tertiary alcohols (alkanols or alkyl alcohols C_n H_{2n+1} OH) with n carbon atoms.at n=16A000600
• Numbers k such that k^2 and k^3 have the same set of digits.at n=36A029797
• Number of partitions of n into parts not of the form 13k, 13k+5 or 13k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 5 are greater than 1.at n=43A035953
• Prime numbers that are the sum of the first k lucky numbers, A046279(k), for some k.at n=9A046281
• Primes p such that |100-p|, |1000-p|, |10000-p| and |100000-p| are also primes.at n=27A126021
• Primes p such that none of p-2, p-1, p+1, and p+2 is squarefree.at n=13A153215
• Primes of the form Sum_{k=1..m} (m^k mod (m+k)).at n=21A156557
• Primes such that applying "reverse and add" twice produces two more primes.at n=11A174402
• Number of zero-sum -n..n arrays of 4 elements with adjacent element differences also in -n..n.at n=23A202254
• Primes of the form 2*n^2+38*n+17.at n=40A243890
• Number of (n+2) X (3+2) 0..3 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=19A252714
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 507", based on the 5-celled von Neumann neighborhood.at n=31A272587
• Primes p such that (p^128 + 1)/2 is prime.at n=17A341230
• Primes p such that if q is the next prime, p+A004086(q) and q+A004086(p) are prime.at n=32A351728
• Prime numbersat n=2959