A022999 Areas for which ApSimon's diagonal point triangle problem has no solution.

1, 2, 3, 4, 8, 9, 13, 17, 23, 31, 37, 43, 46, 47, 51, 53, 59, 61, 67, 73, 79, 83, 92, 93, 94, 97, 101, 103, 106, 107, 111, 113, 118, 127, 129, 137, 139, 149, 151, 157, 159, 163, 166, 167, 173, 177, 179, 188, 191, 193, 197, 199, 201, 202, 211

Offset

1,2

Comments

137 is missing from the list of Bremner on page 165 of the Guy paper. However, 137 is definitely a member since 137 is prime and not of the form m^2+m-1. - Sean A. Irvine, May 23 2019

Links

Table of n, a(n) for n=1..55.

R. K. Guy, ApSimon's diagonal point triangle problem, Amer. Math. Monthly, 104 (1997), 163-167.

Sean A. Irvine, Java program (github).

Crossrefs

Sequence in context: A335761 A127483 A130804 * A244151 A057844 A281089

Adjacent sequences: A022996 A022997 A022998 * A023000 A023001 A023002

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

Missing 137 inserted and more terms from Sean A. Irvine, May 23 2019

Status

approved