21503

Properties

Appears in sequences

• Primes that divide Fibonacci number F(2^k) for some k.at n=7A074714
• Balanced primes of order eleven.at n=10A096703
• Number of compositions of n where the smallest part is greater than the number of parts.at n=50A098132
• Where records occur in A118522.at n=15A118524
• Primes p that divide Fibonacci[(p+1)/7].at n=28A125252
• Numbers k such that k divides 1 + Sum_{j=1..k} prime(j)^5 = 1 + A122103(k).at n=18A128169
• Primes congruent to 31 mod 61.at n=40A142829
• Primes p such that (p-7)/8 and 8p + 7 are both prime.at n=24A158238
• a(n) = 1024*n - 1.at n=20A158421
• a(n) = (4*n^3 - 9*n^2 + 11*n + 3)/3.at n=26A161707
• Primes of the form k*(k+2)/3 - 2, k > 0.at n=33A162307
• Expansion of x/((1-x)^3*(1-x^2)^3*(1-x^3)).at n=21A164680
• a(n) = 21*2^n - 1.at n=10A171389
• G.f. for Ehrhart quasi-polynomials for hyperplane arrangements of type E_6.at n=33A210634
• Primes that are the sum of 51 consecutive primes.at n=14A215992
• Prime numbers after which at least four distinct classes modulo 7 are equally represented among the primes to that point.at n=25A217147
• The n-th prime with n 1-bits in its binary expansion.at n=11A236513
• Rounded down ratio of area of a unit circle and one of the circles inscribed between a regular n-gon and a circumscribed unit circle.at n=16A244094
• Primes p such that p - 2^2, p - 4^2 and p - 6^2 are all positive primes.at n=30A246873
• Decimal representation of the middle column of the "Rule 169" elementary cellular automaton starting with a single ON (black) cell.at n=14A267589