A217416 Numbers of the form 2^r*13^s whose decimal representations are such that each digit 0-9 appears a prime number of times.

19461082905477938625332224, 1493825030770756769826391724130304, 1341437769548771819714842333610521088, 1888426137230419620556768936800026624

Offset

1,1

Comments

See the formula section for more data, and the other sequences in cross-reference for similar and motivation.

Links

Table of n, a(n) for n=1..4.

Formula

a(n) = 2^A217417(n) * 13^A217418(n).

Example

A217417(1)=10 and A217418(1)=20, so this sequence's first term can be simply written as 338^10 (338=2*13^2).  It has two each of 0's, 1's, 5's, 6's, 7's and 8's; three each of 3's, 4's and 9's; and five 2's.

Crossrefs

Cf. A217854, A217417, A217418, A217404, A217407, A217410, A217413, A217419, A217422, A217425, A217428, A217431.

Sequence in context: A009190 A095444 A309072 * A358418 A133849 A343357

Adjacent sequences: A217413 A217414 A217415 * A217417 A217418 A217419

Keyword

nonn,base,less

Author

James G. Merickel, Oct 03 2012

Status

approved