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A125631 Numbers of the form 2*prime(i) - prime(i+1) + 2. 1
3, 5, 11, 17, 19, 27, 29, 35, 41, 43, 49, 57, 59, 65, 69, 71, 77, 79, 83, 95, 101, 107, 125, 127, 131, 137, 147, 149, 153, 161, 163, 169, 173, 179, 189, 191, 197, 201, 221, 227, 229, 233, 239, 247, 253, 259, 267, 269, 275, 281, 305, 311, 327, 329, 347, 349, 353 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
A124115 sorted and duplicates removed.
LINKS
EXAMPLE
2*prime(21) - prime(22) + 2 = 2*73 - 79 + 2 = 69, so 69 is in the sequence.
MATHEMATICA
2#[[1]]-#[[2]]+2&/@Partition[Prime[Range[80]], 2, 1]//Union (* Harvey P. Dale, Nov 28 2023 *)
PROG
(PARI) {p=2; q=3; v=[]; while(p<370, v=concat(v, 2*p-q+2); p=q; q=nextprime(q+1)); v=listsort(List(v), 1); for(j=1, #v-1, print1(v[j], ", "))}
CROSSREFS
Cf. A124115.
Sequence in context: A088328 A102643 A279767 * A045408 A092740 A214296
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Nov 28 2006
STATUS
approved

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Last modified March 29 06:34 EDT 2024. Contains 371265 sequences. (Running on oeis4.)