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

1,2

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.

Formula

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

Example

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.

Prog

(PARI) See Links section.

Crossrefs

Cf. A087207, A360519.

Sequence in context: A087122 A358336 A286900 * A361322 A037221 A182537

Adjacent sequences: A361108 A361109 A361110 * A361112 A361113 A361114

Keyword

nonn,base

Author

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

Extensions

More terms from Rémy Sigrist, Mar 03 2023

Status

approved