65703

Appears in sequences

• Numbers n such that sopf(n) = sopf(n+1) - sopf(n-1), where sopf(x) = sum of the distinct prime factors of x.at n=13A076525
• Triangular numbers whose sum of aliquot divisors is a prime number.at n=29A083676
• Triangular numbers that are the product of 2 palindromes greater than 1.at n=34A115744
• Smallest triangular number whose decimal expansion ends (nontrivially) with the n-th triangular number.at n=36A229262
• Sum of the abscissae of the first descents of all bargraphs of semiperimeter n (n>=2).at n=10A273898
• Number of generalizations of the partition 1^n with all elements taken modulo 2.at n=19A276033
• Integers m such that A342805(m) = m+3.at n=33A342806
• Numbers k such that sigma(k)^2 is divisible by k-1.at n=40A344347