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A084441 Primes that can be written as 1+p+p^k, p prime and k>0. 5
5, 7, 11, 13, 19, 23, 31, 47, 59, 67, 83, 107, 131, 167, 179, 227, 263, 307, 347, 359, 383, 467, 479, 503, 563, 587, 631, 719, 733, 839, 863, 887, 983, 1019, 1187, 1283, 1307, 1319, 1367, 1439, 1487, 1523, 1619, 1723, 1823, 1907, 2027, 2039, 2063, 2099, 2207 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A084440(a(n))>0; safe primes (A005385) are a subset.

LINKS

Table of n, a(n) for n=1..51.

EXAMPLE

prime(6) = 13 = 1+3+3^2, therefore 13 is a term; A084440(6)=1.

CROSSREFS

Cf. A084442, A084443, A084444, A084445.

Sequence in context: A298867 A039681 A216746 * A180950 A112397 A081759

Adjacent sequences:  A084438 A084439 A084440 * A084442 A084443 A084444

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 26 2003

STATUS

approved

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Last modified July 26 14:45 EDT 2021. Contains 346294 sequences. (Running on oeis4.)