30521
domain: N
Appears in sequences
- Convolution of L(n+1) := A000204(n+1) (Lucas), n>=0, with L(n+2), n>=0.at n=13A067980
- a(n) = 2*5^n - 3^n.at n=6A081625
- Number of perfect matchings (or domino tilings) in O_6 X P_n.at n=3A145404
- Number of Carmichael numbers (A002997) less than 2^n.at n=44A225005
- Composite numbers whose concatenation of their aliquot parts, in descending order, is a palindrome.at n=41A249301
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 537", based on the 5-celled von Neumann neighborhood.at n=31A272792
- Numbers k such that 32771*2^k + 1 is prime.at n=34A281483