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A084440 Number of ways to write the n-th prime as 1+p+p^k, p prime and k>0. 5
0, 0, 1, 2, 2, 1, 0, 1, 1, 0, 2, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

a(A084441(n))>0, a(A084442(n))=1, a(A084443(n))=0.

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

a(11)=2: prime(11) = 31 = 1+5+5^2 = 1+3+3^3.

CROSSREFS

Sequence in context: A227193 A287397 A111407 * A179287 A016372 A016342

Adjacent sequences:  A084437 A084438 A084439 * A084441 A084442 A084443

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 26 2003

STATUS

approved

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Last modified October 23 17:32 EDT 2019. Contains 328373 sequences. (Running on oeis4.)