23479

Appears in sequences

• Pseudoprimes to base 60.at n=39A020188
• Strong pseudoprimes to base 60.at n=15A020286
• Strong pseudoprimes to base 96.at n=15A020322
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 79 ones.at n=0A031847
• Number of partitions satisfying cn(0,5) < cn(1,5) + cn(2,5) + cn(3,5) and cn(0,5) < cn(4,5) + cn(2,5) + cn(3,5).at n=37A039847
• Odd composite numbers which in base 2 contain their largest proper factor as a substring of digits.at n=30A063131
• Composite numbers not divisible by 2, 3, 5 or 7 which in base 2 contain their largest proper factor as a substring.at n=24A063138
• Composite numbers not divisible by 2 which in base 4 contain their largest proper factor as a substring.at n=8A063145
• Triple Peano sequence: a list of triples (x,y,z) starting at (1,1,1); then x'=x+1, y'=y+x, z'=z+y, for x only ranging over the primes.at n=47A071988
• Third terms of triple Peano sequence A071988.at n=15A072206
• Bisection of A000125.at n=26A100503
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-11111-00100 pattern in any orientation.at n=20A147007
• Numbers k such that 12321*2^k + 1 is prime.at n=31A180924
• Those terms of A255571 whose every A080541/A080542-rotation is also a term of A255571.at n=43A258001
• Capped binary boundary codes for holeless strictly non-overlapping polyhexes (all orientations and rotations included).at n=13A258002
• Capped binary boundary codes for fusenes (all orientations and rotations included).at n=13A258012
• Triangle read by rows: number of topologies of n nested circles intersecting at most as binaries, according to number of factors.at n=46A281348
• Numbers k such that sigma(k) - k - 1 is a perfect number.at n=9A293992
• Composite numbers k coprime to 13 such that k divides A006190(k-Kronecker(13,k)).at n=20A327653
• Composite numbers k coprime to 13 such that k divides A006190(k) - Kronecker(13,k).at n=26A327654