A072580 A000040(A072577(n)).

11, 13, 71, 79, 89, 107, 127, 131, 139, 157, 179, 181, 227, 229, 331, 337, 419, 421, 433, 457, 461, 487, 491, 787, 797, 809, 811, 821, 823, 853, 877, 919, 977, 1163, 1181, 1213, 1223, 1231, 1277, 1279, 1459, 1487, 1523, 1667, 1697, 1733, 1741, 1861, 1867

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Example

In binary representation 20 and A000040(20)=71 have three 0's: 13='10100' and 71='1000111', therefore 71 is a term.

Crossrefs

Cf. A072581, A072582, A072439, A072584.

A023416(a(n))=A023416(A072577(n))=A035103(n).

Sequence in context: A036295 A132201 A057189 * A186640 A226242 A116436

Adjacent sequences: A072577 A072578 A072579 * A072581 A072582 A072583

Keyword

nonn

Author

Reinhard Zumkeller, Jun 23 2002

Status

approved