19791

Appears in sequences

• Lucky numbers that are both palindromic and nonprime.at n=36A031880
• Cubeful (i.e., not cubefree) palindromes.at n=31A035133
• Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 3,0,1.at n=4A037651
• Palindromic and divisible by 9.at n=33A045644
• Number of factorable (see A057765 for definition) subsets of a 2 X n uniform grid.at n=9A057818
• Palindromes divisible by their digit sum.at n=41A082232
• Numbers n such that (22^n+1)^2-2 is prime.at n=7A100908
• a(n) = 1 if a(n-1) is prime, else a(n) = a(n-2)+a(n-3); starting with a(0) = 0, a(1) = a(2) = 1.at n=48A142884
• a(n) = n*(n^2+4).at n=27A155965
• Smallest palindrome beginning with n-th prime.at n=44A185267
• a(n) = (binomial(2n, n) - 2) mod n^3.at n=38A246133
• Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 king-move adjacent elements, with upper left element zero.at n=12A298315
• Expansion of Product_{k>=0} (1 + x^(3^k))^(3^(k+1)).at n=22A321354
• Expansion of Product_{k>=0} (1 + x^(3^k))^(3^(k+1)).at n=23A321354
• a(n) = Sum_{k=1..n} (-1)^(k+1) * floor((n/k)^3).at n=27A350222
• Odd numbers k such that A173557(k) = A173557(sigma(k)), where A173557(n) is multiplicative with a(p^e) = p-1 and sigma is the sum of divisors function.at n=22A387159
• Expansion of g^2/(1 - x^2*g^4), where g = 1+x*g^4 is the g.f. of A002293.at n=6A391082