5470921

Appears in sequences

• Squares-of-primes in which no two adjacent digits have the same parity.at n=27A030146
• Numbers k such that the sum of the cubes of divisors of k is a prime.at n=17A063783
• Member r=15 of the family of Chebyshev sequences S_r(n) defined in A092184.at n=7A098300
• Numbers n such that 2n-1 and sigma(n) are both primes.at n=24A249902
• Number of n X 6 0..1 arrays with every element unequal to 0, 1 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=17A299593