24253

Appears in sequences

• (n - phi(n)) | sigma(n) for composite n not congruent to 2 (mod 4).at n=30A055164
• Numbers k such that 3*R_k - 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=26A055557
• Numbers m such that the positive values of m - A002110(k) are all primes (k > 0).at n=43A068372
• Expansion of x^4*(1-2*x-2*x^2)/(1-4*x+x^4-2*x^5-2*x^6).at n=12A115220
• Those terms of A255571 whose every A080541/A080542-rotation is also a term of A255571.at n=47A258001
• Capped binary boundary codes for holeless strictly non-overlapping polyhexes (all orientations and rotations included).at n=17A258002
• Capped binary boundary codes for fusenes (all orientations and rotations included).at n=17A258012
• Palindromic numbers in bases 2 and 8 written in base 10.at n=54A259380
• Numbers k such that (11*10^k + 19)/3 is prime.at n=31A270339
• Numerators of the partial alternating sums of the reciprocals of the sum of bi-unitary divisors function (A188999).at n=34A379617