34420

Appears in sequences

• For a number k of length L, let f(k) be the sum of the products of the first i digits of k multiplied by the last L-i digits, for i from 1 to L-1, e.g., f(1234) = 1*234 + 12*34 + 123*4 = 1134. Sequence gives k such that f(k) = k.at n=10A065759
• Numbers k such that sigma(k)*k is a triangular number.at n=29A115909
• Sum of squares of four consecutive primes.at n=22A133524
• Number of partitions of n having no parts with multiplicity 7.at n=40A184642
• a(n) is the smallest number k such that 2*k*n + 1 is a prime dividing prime(n)^n + 1.at n=10A191547
• Consider any concatenation of the type n = concat(a,b). Sequence lists numbers that are the sum of the products of some of such couples a and b.at n=35A265737