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A098598 Number of primes in sequences formed from the t digits of n where the latter terms are given by rule b(i)=sum of t previous terms; primes are counted from initial t digits up to the largest term < n^2. 3
5, 5, 5, 5, 5, 5, 4, 3, 4, 2, 3, 7, 2, 6, 1, 6, 1, 5, 1, 4, 3, 6, 7, 2, 7, 5, 1, 5, 5, 1, 0, 6, 1, 5, 0, 6, 0, 7, 0, 5, 3, 6, 7, 6, 6, 2, 6, 7, 5, 6, 0, 5, 1, 1, 0, 6, 0, 5, 0, 0, 3, 5, 6, 5, 5, 5, 6, 2, 5, 5, 0, 3, 1, 4, 0, 4, 0, 5, 0, 4, 0, 4, 8, 1, 3, 4, 0, 6, 6, 0, 4, 4, 6, 3, 4, 3, 3, 3, 2, 4, 6, 7, 4, 7, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

10,1

LINKS

Table of n, a(n) for n=10..114.

EXAMPLE

a(21)=7 because there are 7 primes in the sequence

2,1,3,4,7,11,18,29,47,76,123,199,322.

CROSSREFS

Cf. A007629, A073882.

Sequence in context: A269268 A112110 A142864 * A010716 A021022 A032560

Adjacent sequences:  A098595 A098596 A098597 * A098599 A098600 A098601

KEYWORD

base,easy,nonn

AUTHOR

Jason Earls, Sep 17 2004

STATUS

approved

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Last modified October 18 18:10 EDT 2018. Contains 316323 sequences. (Running on oeis4.)