A361111 The binary expansion of a(n) specifies which primes divide A360519(n).

0, 3, 5, 12, 10, 3, 5, 20, 18, 3, 9, 24, 18, 6, 5, 17, 48, 34, 3, 9, 40, 36, 7, 65, 72, 10, 3, 33, 96, 66, 11, 129, 132, 6, 3, 17, 80, 68, 5, 257, 258, 130, 129, 33, 34, 6, 13, 513, 514, 1026, 1025, 9, 14, 2050, 2049, 65, 66, 4098, 4097, 5, 260, 264, 11, 7

Offset: 1

Author

Scott R. Shannon and N. J. A. Sloane, Mar 03 2023

Keywords

• nonn
• base

Examples

			A360519(6) = 12, which is divisible by 2, 3, but not 5, 7, 11, ... So we write down 1, 1, 0, 0, 0, .... Thus a(6) has binary expansion ...00011, and so a(6) = 3.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, PARI program
• N. J. A. Sloane, Table showing A360519(1)-A360519(13), also the smallest missing number (smn, A361109 and A361110), binary vectors showing which terms are divisible by the primes 2, 3, 5, 7, 11; and phi, a decimal representation of those binary vectors (A361111). This sequence forms the bottom row of the table.

Crossrefs

Cf. A087207, A360519.

Programs

PARI

See Links section.

Formula

a(n) = A087207(A360519(n)). - Rémy Sigrist, Mar 03 2023

Extensions

More terms from Rémy Sigrist, Mar 03 2023