A037988 - OEIS

A037988

Critical values in Conway's game of one-dimensional phutball.

1, 3, 4, 7, 9, 10, 11, 15, 16, 19, 21, 23, 24, 25, 26, 31, 33, 34, 35, 39, 40, 43, 44, 47, 49, 51, 53, 54, 55, 56, 57, 63, 64, 67, 69, 71, 72, 73, 74, 79, 81, 82, 83, 87, 89, 90, 91, 95, 96, 99, 100, 103, 104, 107, 109, 111, 113, 115, 116

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

The first player can move the ball 2*a(n) spaces before the second player can move the ball 2*(a(n-1) + 1) spaces.

A self-describing sequence. Pick any number n; this n says: "There are n terms in the sequence which are <= 2n". This sequence is the slowest increasing one with this property. - Eric Angelini, Jun 15 2007

Conjectured partial sums of A272729 (true for at least 8192 terms). - Sean A. Irvine, Jun 26 2022

REFERENCES

Berlekamp, Conway and Guy, "Winning Ways", Volume 2. Academic Press, 1982

LINKS

Table of n, a(n) for n=0..58.

Sean A. Irvine, Java program (github)

CROSSREFS

Cf. A272729.

Sequence in context: A010435 A057709 A139442 * A213508 A088958 A300061

Adjacent sequences: A037985 A037986 A037987 * A037989 A037990 A037991

KEYWORD

easy,nonn

AUTHOR

Erich Friedman

STATUS

approved