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.

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.

Links

Table of n, a(n) for n=1..5.

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.

Crossrefs

Cf. A217854, A217423, A217424, A217404, A217407, A217410, A217413, A217416, A217419, A217425, A217428, A217431.

Sequence in context: A003813 A003806 A257374 * A328860 A377422 A095442

Adjacent sequences: A217419 A217420 A217421 * A217423 A217424 A217425

Keyword

nonn,base,less

Author

James G. Merickel, Oct 05 2012

Status

approved