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 A096489 Noncomposite numbers n such that number of decimal digits of n = number of divisors of n. 2
 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; text; internal format)
 OFFSET 1,2 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. LINKS 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}] PROG (PARI) print1(1); forprime(p=9, 99, print1(", "p)) \\ Charles R Greathouse IV, Apr 27, 2011 CROSSREFS Cf. A008364, A095862. Sequence in context: A063193 A056758 A322273 * A008364 A140461 A120533 Adjacent sequences:  A096486 A096487 A096488 * A096490 A096491 A096492 KEYWORD base,fini,full,nonn,easy AUTHOR Labos Elemer, Jun 25 2004 STATUS approved

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Last modified July 24 06:30 EDT 2021. Contains 346273 sequences. (Running on oeis4.)