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A074328 Numbers n such that p(1+n^2)-p(n^2)=2, where p(j) is the j-th prime. 0
7, 8, 9, 12, 15, 16, 22, 25, 27, 34, 53, 83, 85, 88, 95, 107, 108, 144, 149, 187, 196, 223, 234, 238, 249, 255, 268, 274, 315, 324, 350, 355, 358, 367, 386, 410, 411, 416, 424, 436, 440, 445, 450, 462, 469, 471, 481, 494, 501, 509, 511, 517, 522, 549, 554, 564 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

n=25 is here because 626th and 625th primes are twin: 4639-4637=2.

MATHEMATICA

t=Table[0, {250}]; t1=Table[0, {250}]; s=0; k=0; Do[s=Prime[1+n^2]-Prime[n^2]; If[s==2, k=k+1; t[[k]]=n; t1[[k]]=Prime[n^2]; Print[{k, n, Prime[n^2]}]], {n, 1, 2500}] t t1

CROSSREFS

Sequence in context: A138580 A192050 A045158 * A174185 A309152 A170933

Adjacent sequences:  A074325 A074326 A074327 * A074329 A074330 A074331

KEYWORD

nonn

AUTHOR

Labos Elemer, Aug 21 2002

STATUS

approved

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Last modified August 4 16:25 EDT 2021. Contains 346447 sequences. (Running on oeis4.)