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A161504
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Primes congruent to {1,2,10,11,19,20} mod 21.
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0
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11, 19, 23, 31, 41, 43, 53, 61, 73, 83, 103, 107, 127, 137, 149, 157, 167, 179, 191, 199, 211, 229, 233, 241, 251, 263, 271, 283, 293, 313, 317, 337, 347, 359, 367, 379, 389, 397, 401, 409, 419, 421, 431, 439, 443, 461, 463, 503, 523, 547, 557, 569, 577, 587
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The cyclotomic polynomial Phi(21p,x) is flat only for p in this sequence.
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FORMULA
| Union of A124826, A141888, A141892, A141893, A141897, A141898
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MATHEMATICA
| Flatten[Table[Select[21*n+{-10, -2, -1, 1, 2, 10}, PrimeQ], {n, 50}]]
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CROSSREFS
| A117223, A160495
Sequence in context: A124139 A136435 A121658 * A165947 A129517 A161601
Adjacent sequences: A161501 A161502 A161503 * A161505 A161506 A161507
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KEYWORD
| nonn
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AUTHOR
| T. D. Noe (noe(AT)sspectra.com), Jun 17 2009
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