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A072192
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Indices of Sophie Germain primes: p and 2p+1 are primes.
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1
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1, 2, 3, 5, 9, 10, 13, 16, 23, 24, 30, 32, 40, 41, 43, 51, 52, 54, 60, 62, 72, 81, 83, 86, 94, 97, 108, 116, 119, 120, 124, 128, 132, 135, 140, 156, 162, 170, 171, 173, 176, 185, 200, 201, 209, 223, 228, 230, 234, 239, 240, 246
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 870.
J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 83.
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LINKS
| M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
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EXAMPLE
| 5 is element of the sequence, P(5)=11 and 2*11+1=23 is prime.
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CROSSREFS
| Cf. A005384.
Sequence in context: A127149 A047606 A047370 * A050158 A057254 A057242
Adjacent sequences: A072189 A072190 A072191 * A072193 A072194 A072195
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KEYWORD
| easy,nonn
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AUTHOR
| Miklos Kristof (kristmikl(AT)freemail.hu), Jul 02 2002
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