A245520 - OEIS

A245520

Index of the smallest prime where n consecutive leading binary digits of the index match n consecutive leading binary digits in the prime.

1, 5, 5, 25, 31, 32, 1014, 1029, 1046, 1052, 1052, 1609194, 1613310, 1615739, 1616376, 1617055, 1617118, 1617155, 1617155, 1617173

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OFFSET

1,2

COMMENTS

Similar to A133583, except the comparison is done in binary.

LINKS

EXAMPLE

a(4) = 25 since 25 in binary is 11001, the 25th prime is 97, or 1100001 in binary and the first 4 digits of these two binary numbers coincide.

CROSSREFS

KEYWORD

nonn,more,base

AUTHOR

Chai Wah Wu, Jul 24 2014

STATUS

approved