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A217422
Numbers of the form 2^r*17^s whose decimal representations are such that each digit 0-9 appears a prime number of times.
13
981750581622330147995648, 28801196957834700781586432, 835992910761480393266512789504, 7295132596707416278470844481536, 76976152675689985407324172386304
OFFSET
1,1
COMMENTS
See formula section for more data. Others in cross-reference are similar and some hold more motivation in comments.
FORMULA
A217422(n) = 2^A217423(n)*17^A217424(n).
EXAMPLE
A217423(1)=47 and A217424(1)=8, so this sequence's first term is 2^47 * 17^8. It has in its decimal representation two copies each of the digits 0, 2, 3, 4, 6 and 7; and three copies each of 1, 5, 8 and 9.
KEYWORD
nonn,base,less
AUTHOR
James G. Merickel, Oct 05 2012
STATUS
approved