235415

Appears in sequences

• Numbers k such that triangular numbers T(k) and T(k+1) sum to another triangular number (that is also a perfect square).at n=7A076708
• Numbers k such that (10^k - 1)/3 + 4*10^floor(k/2) is a palindromic wing prime (a.k.a. near-repdigit palindromic prime).at n=13A077790