77507

Appears in sequences

• Non-palindromic solutions to sigma(R(n)) = sigma(n), where R = A004086 is digit-reversal.at n=30A085329
• Odd numbers n>5 in the representation n=2*p+q, p, q prime, q maximal, at which a larger p than for any smaller n is needed. A195354 gives values of p.at n=12A195353
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+217)^2 = y^2.at n=33A198294
• Semiprimes of the form p*q where p < q such that q divides p^(q+1) + 1 and (q-p)^(q+1) + 1.at n=17A278921