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A096489
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Noncomposite numbers n such that number of decimal digits of n = number of divisors of n.
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1
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1, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Only 1 and primes with 2 decimal digits are here, so the sequence is finite: it consists of 1+25-4=22 terms. Part of A008364. Consists of the terms below 100 from A095862.
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MATHEMATICA
| {u=1, ta=Table[0, {25}]}; Do[s=Apply[Plus, IntegerDigits[n]]; s1=Length[IntegerDigits[n]]; If[Equal[s1, DivisorSigma[0, n]], Print[n]; ta[[u]]=n; u=u+1], {n, 1, 100}]
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PROG
| (PARI) print1(1); forprime(p=9, 99, print1(", "p)) \\ Charles R Greathouse IV, Apr 27, 2011
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CROSSREFS
| Cf. A008364, A095862.
Sequence in context: A084374 A063193 A056758 * A008364 A140461 A120533
Adjacent sequences: A096486 A096487 A096488 * A096490 A096491 A096492
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KEYWORD
| base,fini,full,nonn,easy
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jun 25 2004
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