23239

Appears in sequences

• Interprimes which are of the form s*prime, s=17.at n=12A075292
• Numbers k such that if P = 10*k^2+1, then P, P+6, P+12 and P+18 are all primes.at n=43A092446
• Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits.at n=38A261142
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A295862
• Nonnegative integers k such that k! mod nextprime(k) is larger than k.at n=18A360805
• Number of achiral unicursal star polygons (no edge joins adjacent vertices) that can be formed by connecting the vertices of a regular n-gon.at n=13A370769