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A074268 Primes of the form p^2 - p + 1 where p is prime. 3
3, 7, 43, 157, 4423, 6163, 19183, 22651, 26407, 37057, 113233, 121453, 143263, 208393, 292141, 375157, 412807, 527803, 590593, 843643, 981091, 1041421, 1193557, 1246573, 1441201, 1514131, 1905781, 2023507, 2397853, 2453923, 2548813, 2626021, 2864557 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Note that p^2 - p + 1 = p * phi(p) + 1 when p is prime.

MATHEMATICA

Select[Table[p = Prime[n]; p*EulerPhi[p] + 1, {n, 270}], PrimeQ] (* Arkadiusz Wesolowski, Dec 13 2011 *)

CROSSREFS

Cf. A065508 (values of p).

Sequence in context: A101208 A050633 A107636 * A019026 A096843 A181729

Adjacent sequences:  A074265 A074266 A074267 * A074269 A074270 A074271

KEYWORD

nonn

AUTHOR

Enoch Haga (Enokh(AT)comcast.net), Jan 16 2004

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Last modified February 17 10:05 EST 2012. Contains 206009 sequences.