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A122157 Number of primes between two successive numbers congruent to {2, 4} mod 6. 0
2, 2, 0, 2, 0, 2, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 2, 0, 0, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 0, 0, 0, 2, 0, 2, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 2, 0, 2, 0, 0, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Except for twin primes, there are 2n numbers congruent to {2, 4} mod 6 between two consecutive primes

a(n) = 2 iff there are twin primes between two numbers congruent to {2, 4} mod 6.

LINKS

Table of n, a(n) for n=1..87.

CROSSREFS

Sequence in context: A142242 A050314 A316344 * A080378 A243865 A120439

Adjacent sequences:  A122154 A122155 A122156 * A122158 A122159 A122160

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Oct 29 2006, corrected Nov 01 2006

STATUS

approved

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Last modified August 20 10:17 EDT 2019. Contains 326149 sequences. (Running on oeis4.)