20207

Appears in sequences

• Numbers k such that 40*R_k + 9 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=7A056683
• a(n+1) is smallest number with a(n+1)^n > a(n)^(n+1).at n=22A059923
• Multiples of 11 with digit sum 11, with no zero digits in odd places.at n=18A083512
• a(n) = 2^p + 3^p + 5^p + 7^p where p = prime(n).at n=2A098139
• Expansion of (1+x-x^2)/(1-2x-2x^2+x^4).at n=10A109220
• Sum of the fifth powers of the first n primes.at n=3A122103
• Expansion of b(q^2) * c(q^6) / (b(q) * c(q^3)) in powers of q where b(), c() are cubic AGM theta functions.at n=24A123629
• Sum of fifth powers of four consecutive primes.at n=0A133527
• Numbers such that the digital sum base 2 and the digital sum base 5 and the digital sum base 10 all are equal.at n=19A135125
• a(n) = 7^n + 5^n + 3^n + 2^n.at n=5A135168
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (0, 0, -1), (1, -1, 1), (1, 1, 1)}.at n=8A149685
• Number of (n+2) X 6 binary arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=17A190028
• a(n) = Fibonacci(n) + n^3.at n=21A212272
• Expansion of c(q^2) * b(q^6) / (b(q) * c(q) * b(q^3) * c(q^3))^(1/2) in powers of q where b(), c() are cubic AGM theta functions.at n=25A212484
• Expansion of q * psi(-q) * chi(-q^6) * psi(-q^9) / (phi(-q) * phi(-q^18)) in powers of q where phi(), psi(), chi() are Ramanujan theta functions.at n=49A233693
• Expansion of f(-x, -x^5)^3 / (f(x, x^5) * f(-x^2, -x^2)^2) in powers of x where f(, ) is Ramanujan's general theta function.at n=16A260057
• Expansion of f(x, x^5)^3 / (f(-x, -x^5) * f(-x^2, -x^2)^2) in powers of x where f(, ) is Ramanujan's general theta function.at n=16A260150
• Expansion of psi(q^6) * f(-q^12) / (psi(-q) * psi(q^9)) in powers of q where psi(), f() are Ramanujan theta functions.at n=50A261154
• Numbers with digit sum 11 that are multiples of 11.at n=27A283742
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=3A295014