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A114924 Primes p such that pi(p) is obtained by dropping one of the digits of p in decimal expansion. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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).

LINKS

Table of n, a(n) for n=1..32.

EXAMPLE

95517973 is in the sequence because 95517973 is prime and pi(95517973)=5517973.

MATHEMATICA

Do[h=IntegerDigits[Prime@n]; l=Length[h]; If[MemberQ[Table[ FromDigits[Drop[h, {k}]], {k, l}], n], Print[Prime@n]], {n, 20000000}]

CROSSREFS

Cf. A114924.

Sequence in context: A166326 A203678 A257044 * A300596 A308962 A191964

Adjacent sequences:  A114921 A114922 A114923 * A114925 A114926 A114927

KEYWORD

fini,base,nonn

AUTHOR

Farideh Firoozbakht, Jan 14 2006

STATUS

approved

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Last modified October 17 01:03 EDT 2019. Contains 328103 sequences. (Running on oeis4.)