129260

Appears in sequences

• Numbers n such that phi(4n+1) = sigma(n).at n=19A067234
• Number of binary carry-connected subsets of [n] containing n (for n > 0).at n=18A306299
• a(n) = Sum_{k=0..n} (k+1) * binomial(2*k,2*n-2*k).at n=11A381421
• Numbers k such that the binary expansion of k is a prefix of the binary expansion of A003961(k), where A003961 is fully multiplicative with a(p) = nextprime(p).at n=10A387414