OFFSET
1,1
REFERENCES
David Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, Revised edition 1987. See entry 496 at p. 155.
EXAMPLE
29 is a term since it is prime and A000217(29) - 2 = 433 is prime.
MATHEMATICA
Select[Range[700], PrimeQ[#]&&(PrimeQ[t=#(#+1)/2+1]||PrimeQ[t-3]) &]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Stefano Spezia, Sep 15 2024
STATUS
approved