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A213014 Number of zeros following the initial 1 in n-th absolute difference of primes. 2
0, 1, 0, 0, 0, 0, 0, 0, 6, 5, 4, 3, 2, 1, 0, 0, 1, 0, 0, 2, 1, 0, 0, 0, 3, 2, 1, 0, 0, 1, 0, 3, 2, 1, 0, 0, 6, 5, 4, 3, 2, 1, 0, 0, 1, 0, 0, 1, 0, 2, 1, 0, 1, 0, 0, 0, 0, 6, 5, 4, 3, 2, 1, 0, 2, 1, 0, 0, 2, 1, 0, 0, 1, 0, 5, 4, 3, 2, 1, 0, 1, 0, 0, 0, 0, 0, 2, 1, 0, 0, 2, 1, 0, 0, 4, 3, 2, 1, 0, 0, 0, 0, 3, 2, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

COMMENTS

Related to Gilbreath's conjecture: number of "0"s preceding the first term > 1 in the n-th row of the table A036261 (= row n of the table A036262 which starts with row 0).

Gilbreath's conjecture would be violated if the initial 1 would not always be followed by some number (>= 0) of "0"s and then a "2" as the first term > 1. See also A089582.

LINKS

Table of n, a(n) for n=1..107.

PROG

(PARI) my( p=primes(150), D(v)=vecextract(v, "^1")-vecextract(v, "^-1")); while(p=abs(D(p)), for(i=2, #p, p[i] & !print1(i-2", ") & next(2)); break)

CROSSREFS

Sequence in context: A263879 A085664 A154007 * A022962 A023448 A307337

Adjacent sequences:  A213011 A213012 A213013 * A213015 A213016 A213017

KEYWORD

nonn

AUTHOR

M. F. Hasler, Jun 02 2012

STATUS

approved

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Last modified May 31 16:29 EDT 2020. Contains 334748 sequences. (Running on oeis4.)