A067464 -id:A067464

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Search: a067464 -id:a067464

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A067463

Primes p such that p+sigma(p+1) is prime.

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5, 13, 19, 23, 29, 37, 41, 43, 53, 59, 61, 67, 83, 101, 103, 113, 131, 149, 157, 163, 167, 193, 223, 227, 229, 239, 263, 271, 281, 283, 293, 311, 313, 331, 347, 349, 373, 397, 401, 433, 461, 467, 491, 503, 523, 563, 571, 599, 601, 607, 631, 643, 653, 661, 683

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

PROG

(PARI) isok(p) = isprime(p) && isprime(p+sigma(p+1)); \\ Michel Marcus, Feb 17 2021

CROSSREFS

Cf. A008333, A067464.

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Feb 23 2002

STATUS

approved

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