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A214603 Location of the first gap of exactly n in Ulam numbers, or zero if none is known. The zero terms are conjectural. 4
1, 4, 8, 53, 48, 0, 62, 18, 38, 87, 0, 114, 260, 0, 221, 0, 568, 0, 627, 155, 0, 646, 0, 1724, 695, 0, 282, 0, 1433, 751, 0, 36460, 0, 949, 483379914, 0, 8018, 0, 1257, 0, 1553, 1858, 0, 4057, 0, 9262, 3825, 0, 10606, 0, 115835, 3153, 0, 0, 0, 6982 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Some terms are believed to not exist. However, the first gap of 35 occurs at 483379914 and the first gap of 88 occurs at 1127544124. - Jud McCranie, Jul 31 2012

LINKS

Table of n, a(n) for n=1..56.

Jud McCranie, Known terms up to 890

EXAMPLE

The first gap of 5 in Ulam numbers occurs after 48, so a(5) = 48.

CROSSREFS

Cf. A002858, A080287, A080288.

Sequence in context: A189314 A215746 A128893 * A192508 A231601 A123106

Adjacent sequences:  A214600 A214601 A214602 * A214604 A214605 A214606

KEYWORD

nonn

AUTHOR

Jud McCranie, Jul 22 2012

STATUS

approved

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Last modified January 20 19:53 EST 2020. Contains 331096 sequences. (Running on oeis4.)