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Search: id:A114924
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| A114924 |
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Primes p such that pi(p) is obtained by dropping one of the digits of p in decimal expansion. |
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+0
2
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| 17, 12491, 14723, 42437, 57089, 58193, 61051, 63131, 63347, 64553, 64567, 64577, 64591, 64601, 64661, 64679, 64951, 65071, 65173, 65293, 65881, 66863, 69931, 79817, 99551, 129083, 165103, 263071, 284833, 1407647, 1515259, 4303027
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OFFSET
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1,1
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COMMENT
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If n>31 then we can get pi(a(n)) by dropping the first digit of a(n). Next term is greater than prime(20000000).
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EXAMPLE
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95517973 is in the sequence because 95517973 is prime and pi(95517973)=5517973.
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MATHEMATICA
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Do[h=IntegerDigits[Prime@n]; l=Length[h]; If[MemberQ[Table[ FromDigits[Drop[h, {k}]], {k, l}], n], Print[Prime@n]], {n, 20000000}]
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CROSSREFS
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Cf. A114924.
Sequence in context: A052286 A079687 A062659 this_sequence A134360 A110915 A068733
Adjacent sequences: A114921 A114922 A114923 this_sequence A114925 A114926 A114927
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KEYWORD
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fini,base,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Jan 14 2006
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