A257347 1 followed by the numbers successively added to the four arms of the spirals in A257329, A257330, A257331, A257332.

1, 2, 3, 5, 7, 11, 4, 6, 9, 13, 17, 19, 23, 25, 29, 8, 15, 21, 31, 35, 14, 37, 41, 43, 47, 27, 49, 16, 12, 10, 33, 53, 59, 39, 61, 67, 22, 20, 18, 45, 65, 71, 73, 79, 83, 24, 51, 55, 26, 85, 77, 89, 97, 32, 57, 91, 101, 95, 28, 69, 103, 107

Offset

1,2

Comments

Conjectured to be a permutation of the natural numbers.

Links

Table of n, a(n) for n=1..62.

Popular Computing (Calabasas, CA), Problem 146: Gcd, Vol. 4 (No. 45, Dec 1976), page PC45-4.

N. J. A. Sloane, Spirals showing initial terms of A257321-A257332

Crossrefs

Cf. A257329, A257330, A257331, A257332.

Sequence in context: A330994 A097858 A084408 * A143345 A111679 A349872

Adjacent sequences: A257344 A257345 A257346 * A257348 A257349 A257350

Keyword

nonn

Author

N. J. A. Sloane, Apr 30 2015

Status

approved