24605

Appears in sequences

• a(n+6) = -a(n+5) + a(n+4) + 3a(n+3) + a(n+2) - a(n+1) - a(n). a(n) = sign(n) if abs(n)<=3.at n=36A001945
• Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.at n=34A005564
• Numbers k in which the digits of k^2 appear.at n=35A029774
• Numbers k such that k and k^2 have the same set of digits.at n=16A029793
• Numerators of continued fraction convergents to sqrt(77).at n=8A041136
• Numerators of continued fraction convergents to sqrt(308).at n=8A041580
• (Nearest integer to n^6/36) / 2.at n=10A061005
• Numbers k such that phi(k)/lambda(k) increases to a record value, where phi(k) is the Euler totient function (A000010) and lambda(k) is the Carmichael lambda function (A002322).at n=20A066605
• Numbers which are the sum of two positive cubes and divisible by 37.at n=29A102618
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 6.at n=56A136898
• The number of decades below 10^n whose semiprime pattern is the same as semiprime pattern in the previous decade.at n=5A220343
• Let P be a one-move "rider" with move set M={(1,2)}; a(n) is the number of non-attacking positions of two indistinguishable pieces P on an n X n board.at n=14A222308
• a(n) = n*(n + 1)*(n + 2)*(3*n + 17)/24.at n=19A241765
• Numbers n such that both n and n squared contain exactly the same digits, and n is not divisible by 10.at n=9A258231
• Numbers k such that prime(k) is the hypotenuse of a Pythagorean triple where one leg is also prime.at n=27A342583
• Products k of 4 distinct primes (or tetraprimes) such that k has no squarefree neighbors.at n=39A364141
• Number of partitions of n with at most four part sizes.at n=45A364793
• Number of face-connected components of polyhedral cells in the quarter oblate octahedrille up to translation, rotation, and reflection of the honeycomb.at n=8A385273
• Numbers k such that k - A067666(k) is a square.at n=43A386304