25103

Appears in sequences

• Concatenating n with n+1 (in base 10) gives a number which is the product of 2 palindromes.at n=17A113942
• Number of set partitions C'_t(n) of {1,2,...,t} into at most n parts, with an even number of elements in each part distinguished by marks and such that no part contains both 1 and t (each unmarked) or both i and i+1 (each unmarked) for some i with 1 <= i < t; triangle C'_t(n), t>=0, 0<=n<=t, read by rows.at n=43A261319
• Anagrexpo integers: integers N that exactly reproduce their set of digits when we form the set of exponentiation of pairs of adjacent digits, from left to right.at n=36A297627
• Number of integer partitions of n whose run-lengths are either weakly increasing or weakly decreasing.at n=43A332745
• Numerators of the partial sums of the reciprocals of the alternating sum of divisors function (A206369).at n=33A379619