23089
domain: N
Appears in sequences
- a(n) = (d(n)-r(n))/2, where d = A026049 and r is the periodic sequence with fundamental period (1,0,0,1).at n=47A026050
- Numbers whose set of base-12 digits is {1,4}.at n=36A032824
- Records in A098550.at n=44A248647
- Composites in base 10 that remain composite in exactly four bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.at n=12A256354
- Expansion of (1-x-2*x^2) / (1-6*x+3*x^2-2*x^3).at n=6A275905
- Semiprimes whose binary and ternary representations are prime when read in decimal.at n=26A279052
- Numbers k such that (14*10^k + 229)/9 is prime.at n=17A294940
- Records in A360519.at n=38A361107