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A072580 A000040(A072577(n)). 4
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 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

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 A116436 A056446

Adjacent sequences:  A072577 A072578 A072579 * A072581 A072582 A072583

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 23 2002

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.